diff --git a/docs/api/administration-service.yaml b/docs/api/administration-service.yaml
index 892423282c..891a3ffdc4 100644
--- a/docs/api/administration-service.yaml
+++ b/docs/api/administration-service.yaml
@@ -4257,6 +4257,38 @@ paths:
           description: Internal Server Error
         '401':
           description: The User is unauthorized
+  '/api/administration/registration/application/{applicationId}/retrigger-set-cx-membership':
+    post:
+      tags:
+        - Registration
+      summary: 'Retriggers the last failed step (Authorization required - Roles: approve_new_partner)'
+      parameters:
+        - name: applicationId
+          in: path
+          description: Id of the application that should be triggered
+          required: true
+          schema:
+            type: string
+            format: uuid
+      responses:
+        '204':
+          description: Empty response on success.
+        '400':
+          description: Either the CompanyApplication is not in status SUBMITTED or the next step can't automatically retriggered.
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/ErrorResponse'
+        '404':
+          description: No application found for the applicationId.
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/ErrorResponse'
+        '500':
+          description: Internal Server Error
+        '401':
+          description: The User is unauthorized
   /api/administration/RegistrationStatus/callback:
     get:
       tags:
@@ -7529,6 +7561,8 @@ components:
         - RETRIGGER_REMOVE_REGISTRATION_ROLES
         - RETRIGGER_SET_THEME
         - RETRIGGER_SET_MEMBERSHIP
+        - SET_CX_MEMBERSHIP_IN_BPDM
+        - RETRIGGER_SET_CX_MEMBERSHIP_IN_BPDM
         - TRIGGER_PROVIDER
         - AWAIT_START_AUTOSETUP
         - OFFERSUBSCRIPTION_CLIENT_CREATION
diff --git a/docs/api/apps-service.yaml b/docs/api/apps-service.yaml
index 648af38be3..160ca530dc 100644
--- a/docs/api/apps-service.yaml
+++ b/docs/api/apps-service.yaml
@@ -3563,6 +3563,8 @@ components:
         - RETRIGGER_REMOVE_REGISTRATION_ROLES
         - RETRIGGER_SET_THEME
         - RETRIGGER_SET_MEMBERSHIP
+        - SET_CX_MEMBERSHIP_IN_BPDM
+        - RETRIGGER_SET_CX_MEMBERSHIP_IN_BPDM
         - TRIGGER_PROVIDER
         - AWAIT_START_AUTOSETUP
         - OFFERSUBSCRIPTION_CLIENT_CREATION
diff --git a/docs/api/services-service.yaml b/docs/api/services-service.yaml
index c585977aed..9a9a4ab529 100644
--- a/docs/api/services-service.yaml
+++ b/docs/api/services-service.yaml
@@ -2143,6 +2143,8 @@ components:
         - RETRIGGER_REMOVE_REGISTRATION_ROLES
         - RETRIGGER_SET_THEME
         - RETRIGGER_SET_MEMBERSHIP
+        - SET_CX_MEMBERSHIP_IN_BPDM
+        - RETRIGGER_SET_CX_MEMBERSHIP_IN_BPDM
         - TRIGGER_PROVIDER
         - AWAIT_START_AUTOSETUP
         - OFFERSUBSCRIPTION_CLIENT_CREATION
diff --git a/src/administration/Administration.Service/Controllers/RegistrationController.cs b/src/administration/Administration.Service/Controllers/RegistrationController.cs
index b317ec3044..9e73a0e09f 100644
--- a/src/administration/Administration.Service/Controllers/RegistrationController.cs
+++ b/src/administration/Administration.Service/Controllers/RegistrationController.cs
@@ -726,5 +726,27 @@ public async Task<NoContentResult> RetriggerSetMembership([FromRoute] Guid appli
         await logic.TriggerChecklistAsync(applicationId, ApplicationChecklistEntryTypeId.APPLICATION_ACTIVATION, ProcessStepTypeId.RETRIGGER_SET_MEMBERSHIP).ConfigureAwait(ConfigureAwaitOptions.None);
         return NoContent();
     }
+
+    /// <summary>
+    /// Retriggers the last failed step 
+    /// </summary>
+    /// <param name="applicationId" example="">Id of the application that should be triggered</param>
+    /// <returns>NoContent</returns>
+    /// Example: POST: api/administration/registration/application/{applicationId}/retrigger-set-cx-membership
+    /// <response code="204">Empty response on success.</response>
+    /// <response code="400">Either the CompanyApplication is not in status SUBMITTED or the next step can't automatically retriggered.</response>
+    /// <response code="404">No application found for the applicationId.</response>
+    [HttpPost]
+    [Authorize(Roles = "approve_new_partner")]
+    [Authorize(Policy = PolicyTypes.CompanyUser)]
+    [Route("application/{applicationId}/retrigger-set-cx-membership")]
+    [ProducesResponseType(StatusCodes.Status204NoContent)]
+    [ProducesResponseType(typeof(ErrorResponse), StatusCodes.Status400BadRequest)]
+    [ProducesResponseType(typeof(ErrorResponse), StatusCodes.Status404NotFound)]
+    public async Task<NoContentResult> RetriggerSetCxMembership([FromRoute] Guid applicationId)
+    {
+        await logic.TriggerChecklistAsync(applicationId, ApplicationChecklistEntryTypeId.APPLICATION_ACTIVATION, ProcessStepTypeId.RETRIGGER_SET_CX_MEMBERSHIP_IN_BPDM).ConfigureAwait(ConfigureAwaitOptions.None);
+        return NoContent();
+    }
 }
 
diff --git a/src/externalsystems/Bpdm.Library/BpdmService.cs b/src/externalsystems/Bpdm.Library/BpdmService.cs
index 25ebb38997..e74657cc47 100644
--- a/src/externalsystems/Bpdm.Library/BpdmService.cs
+++ b/src/externalsystems/Bpdm.Library/BpdmService.cs
@@ -23,6 +23,7 @@
 using Org.Eclipse.TractusX.Portal.Backend.Framework.HttpClientExtensions;
 using Org.Eclipse.TractusX.Portal.Backend.Framework.Token;
 using System.Net.Http.Json;
+using System.Text;
 using System.Text.Json;
 using System.Text.Json.Serialization;
 
@@ -176,4 +177,23 @@ public async Task<BpdmSharingState> GetSharingState(Guid applicationId, Cancella
             throw new ServiceException($"Access to sharing state did not return a valid json response: {je.Message}");
         }
     }
+
+    /// <inheritdoc />
+    public async Task<bool> SetCxMembership(string businessPartnerNumber, CancellationToken cancellationToken)
+    {
+        using var httpClient = await _tokenService.GetAuthorizedClient<BpdmService>(_settings, cancellationToken).ConfigureAwait(ConfigureAwaitOptions.None);
+
+        var requestData = new BpdmCxMembership(
+            new BpdmCxMembershipDto[]{
+                new(businessPartnerNumber, true)
+            }.AsEnumerable()
+        );
+
+        async ValueTask<(bool, string?)> CreateErrorMessage(HttpResponseMessage errorResponse) =>
+            (false, (await errorResponse.Content.ReadAsStringAsync(cancellationToken).ConfigureAwait(ConfigureAwaitOptions.None)));
+
+        await httpClient.PutAsJsonAsync("v6/cx-memberships", requestData, Options, cancellationToken)
+            .CatchingIntoServiceExceptionFor("bpdm-put-cx-membership", HttpAsyncResponseMessageExtension.RecoverOptions.INFRASTRUCTURE, CreateErrorMessage).ConfigureAwait(false);
+        return true;
+    }
 }
diff --git a/src/externalsystems/Bpdm.Library/IBpdmService.cs b/src/externalsystems/Bpdm.Library/IBpdmService.cs
index ed3673aaf2..d080f4d8c7 100644
--- a/src/externalsystems/Bpdm.Library/IBpdmService.cs
+++ b/src/externalsystems/Bpdm.Library/IBpdmService.cs
@@ -44,4 +44,12 @@ public interface IBpdmService
     Task<bool> SetSharingStateToReady(string externalId, CancellationToken cancellationToken);
     Task<BpdmLegalEntityOutputData> FetchInputLegalEntity(string externalId, CancellationToken cancellationToken);
     Task<BpdmSharingState> GetSharingState(Guid applicationId, CancellationToken cancellationToken);
+
+    /// <summary>
+    /// Send membership information to the BPDM Pool
+    /// </summary>
+    /// <param name="businessPartnerNumber">The BPN to set Cx Membership</param>
+    /// <param name="cancellationToken">Cancellation Token</param>
+    /// <returns>Returns <c>true</c> if the service call was successful, otherwise <c>false</c></returns>
+    Task<bool> SetCxMembership(string businessPartnerNumber, CancellationToken cancellationToken);
 }
diff --git a/src/externalsystems/Bpdm.Library/Models/BpdmCxMembershipDto.cs b/src/externalsystems/Bpdm.Library/Models/BpdmCxMembershipDto.cs
new file mode 100644
index 0000000000..0424824458
--- /dev/null
+++ b/src/externalsystems/Bpdm.Library/Models/BpdmCxMembershipDto.cs
@@ -0,0 +1,40 @@
+/********************************************************************************
+ * Copyright (c) 2022 BMW Group AG
+ * Copyright (c) 2022 Contributors to the Eclipse Foundation
+ *
+ * See the NOTICE file(s) distributed with this work for additional
+ * information regarding copyright ownership.
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Apache License, Version 2.0 which is available at
+ * https://www.apache.org/licenses/LICENSE-2.0.
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ ********************************************************************************/
+
+using System.Text.Json.Serialization;
+namespace Org.Eclipse.TractusX.Portal.Backend.Bpdm.Library.Models;
+
+/// <summary>
+/// Modal to send multiple data to BPDM.
+/// </summary>
+/// <param name="Memberships">List of memberships</param>
+public record BpdmCxMembership(
+    [property: JsonPropertyName("memberships")] IEnumerable<BpdmCxMembershipDto> Memberships
+);
+
+/// <summary>
+/// Modal to send single data to BPDM.
+/// </summary>
+/// <param name="Bpn">Business Partner Number</param>
+/// <param name="IsCatenaXMember">True, if BPN has added for Catena-X mambership</param>
+public record BpdmCxMembershipDto(
+    [property: JsonPropertyName("bpnL")] string Bpn,
+    [property: JsonPropertyName("isCatenaXMember")] bool IsCatenaXMember
+);
diff --git a/src/portalbackend/PortalBackend.PortalEntities/Enums/ProcessStepTypeId.cs b/src/portalbackend/PortalBackend.PortalEntities/Enums/ProcessStepTypeId.cs
index 35c002c0f3..e799abbbe1 100644
--- a/src/portalbackend/PortalBackend.PortalEntities/Enums/ProcessStepTypeId.cs
+++ b/src/portalbackend/PortalBackend.PortalEntities/Enums/ProcessStepTypeId.cs
@@ -64,6 +64,8 @@ public enum ProcessStepTypeId
     RETRIGGER_REMOVE_REGISTRATION_ROLES = 41,
     RETRIGGER_SET_THEME = 42,
     RETRIGGER_SET_MEMBERSHIP = 43,
+    SET_CX_MEMBERSHIP_IN_BPDM = 44,
+    RETRIGGER_SET_CX_MEMBERSHIP_IN_BPDM = 45,
 
     // OfferSubscriptionProcess
     TRIGGER_PROVIDER = 100,
diff --git a/src/processes/ApplicationChecklist.Executor/ApplicationChecklistHandlerService.cs b/src/processes/ApplicationChecklist.Executor/ApplicationChecklistHandlerService.cs
index 48ae16f1db..b8e6a3167f 100644
--- a/src/processes/ApplicationChecklist.Executor/ApplicationChecklistHandlerService.cs
+++ b/src/processes/ApplicationChecklist.Executor/ApplicationChecklistHandlerService.cs
@@ -62,6 +62,7 @@ public class ApplicationChecklistHandlerService(
         new(ProcessStepTypeId.REMOVE_REGISTRATION_ROLES, new(ApplicationChecklistEntryTypeId.APPLICATION_ACTIVATION, true, applicationActivationService.RemoveRegistrationRoles, (ex, _, _) => checklistService.HandleServiceErrorAsync(ex, ProcessStepTypeId.RETRIGGER_REMOVE_REGISTRATION_ROLES))),
         new(ProcessStepTypeId.SET_THEME, new(ApplicationChecklistEntryTypeId.APPLICATION_ACTIVATION, true, applicationActivationService.SetTheme, (ex, _, _) => checklistService.HandleServiceErrorAsync(ex, ProcessStepTypeId.RETRIGGER_SET_THEME))),
         new(ProcessStepTypeId.SET_MEMBERSHIP, new(ApplicationChecklistEntryTypeId.APPLICATION_ACTIVATION, true, applicationActivationService.SetMembership, (ex, _, _) => checklistService.HandleServiceErrorAsync(ex, ProcessStepTypeId.RETRIGGER_SET_MEMBERSHIP))),
+        new(ProcessStepTypeId.SET_CX_MEMBERSHIP_IN_BPDM, new(ApplicationChecklistEntryTypeId.APPLICATION_ACTIVATION, true, applicationActivationService.SetCxMembership, (ex, _, _) => checklistService.HandleServiceErrorAsync(ex, ProcessStepTypeId.RETRIGGER_SET_CX_MEMBERSHIP_IN_BPDM))),
         new(ProcessStepTypeId.FINISH_APPLICATION_ACTIVATION, new(ApplicationChecklistEntryTypeId.APPLICATION_ACTIVATION, true, applicationActivationService.SaveApplicationActivationToDatabase, null))
     ]);
 
diff --git a/src/processes/ApplicationChecklist.Library/ApplicationChecklistEntryTypeIdExtensions.cs b/src/processes/ApplicationChecklist.Library/ApplicationChecklistEntryTypeIdExtensions.cs
index f5ffb38ea7..375444d84b 100644
--- a/src/processes/ApplicationChecklist.Library/ApplicationChecklistEntryTypeIdExtensions.cs
+++ b/src/processes/ApplicationChecklist.Library/ApplicationChecklistEntryTypeIdExtensions.cs
@@ -29,7 +29,7 @@ public static class ApplicationChecklistEntryTypeIdExtensions
         new(ApplicationChecklistEntryTypeId.IDENTITY_WALLET, [ProcessStepTypeId.RETRIGGER_IDENTITY_WALLET, ProcessStepTypeId.RETRIGGER_CREATE_DIM_WALLET, ProcessStepTypeId.RETRIGGER_VALIDATE_DID_DOCUMENT]),
         new(ApplicationChecklistEntryTypeId.SELF_DESCRIPTION_LP, [ProcessStepTypeId.RETRIGGER_SELF_DESCRIPTION_LP]),
         new(ApplicationChecklistEntryTypeId.BUSINESS_PARTNER_NUMBER, [ProcessStepTypeId.RETRIGGER_BUSINESS_PARTNER_NUMBER_PUSH, ProcessStepTypeId.RETRIGGER_BUSINESS_PARTNER_NUMBER_PULL]),
-        new(ApplicationChecklistEntryTypeId.APPLICATION_ACTIVATION, [ProcessStepTypeId.RETRIGGER_ASSIGN_INITIAL_ROLES, ProcessStepTypeId.RETRIGGER_ASSIGN_BPN_TO_USERS, ProcessStepTypeId.RETRIGGER_REMOVE_REGISTRATION_ROLES, ProcessStepTypeId.RETRIGGER_SET_THEME, ProcessStepTypeId.RETRIGGER_SET_MEMBERSHIP])
+        new(ApplicationChecklistEntryTypeId.APPLICATION_ACTIVATION, [ProcessStepTypeId.RETRIGGER_ASSIGN_INITIAL_ROLES, ProcessStepTypeId.RETRIGGER_ASSIGN_BPN_TO_USERS, ProcessStepTypeId.RETRIGGER_REMOVE_REGISTRATION_ROLES, ProcessStepTypeId.RETRIGGER_SET_THEME, ProcessStepTypeId.RETRIGGER_SET_MEMBERSHIP, ProcessStepTypeId.RETRIGGER_SET_CX_MEMBERSHIP_IN_BPDM])
     ]);
 
     public static IEnumerable<ProcessStepTypeId> GetManualTriggerProcessStepIds(this ApplicationChecklistEntryTypeId entryTypeId) =>
@@ -56,6 +56,7 @@ public static (ProcessStepTypeId ProcessStepTypeId, ApplicationChecklistEntrySta
             ProcessStepTypeId.RETRIGGER_REMOVE_REGISTRATION_ROLES => (ProcessStepTypeId.REMOVE_REGISTRATION_ROLES, ApplicationChecklistEntryStatusId.IN_PROGRESS),
             ProcessStepTypeId.RETRIGGER_SET_THEME => (ProcessStepTypeId.SET_THEME, ApplicationChecklistEntryStatusId.IN_PROGRESS),
             ProcessStepTypeId.RETRIGGER_SET_MEMBERSHIP => (ProcessStepTypeId.SET_MEMBERSHIP, ApplicationChecklistEntryStatusId.IN_PROGRESS),
+            ProcessStepTypeId.RETRIGGER_SET_CX_MEMBERSHIP_IN_BPDM => (ProcessStepTypeId.SET_CX_MEMBERSHIP_IN_BPDM, ApplicationChecklistEntryStatusId.IN_PROGRESS),
             _ => default,
         };
 }
diff --git a/src/registration/ApplicationActivation.Library/ApplicationActivation.Library.csproj b/src/registration/ApplicationActivation.Library/ApplicationActivation.Library.csproj
index 721b5a1ef5..3fc62150b4 100644
--- a/src/registration/ApplicationActivation.Library/ApplicationActivation.Library.csproj
+++ b/src/registration/ApplicationActivation.Library/ApplicationActivation.Library.csproj
@@ -35,6 +35,7 @@
 
     <ItemGroup>
       <ProjectReference Include="..\..\externalsystems\Custodian.Library\Custodian.Library.csproj" />
+      <ProjectReference Include="..\..\externalsystems\Bpdm.Library\Bpdm.Library.csproj" />
       <ProjectReference Include="..\..\framework\Framework.DateTimeProvider\Framework.DateTimeProvider.csproj" />
       <ProjectReference Include="..\..\notifications\Notifications.Library\Notifications.Library.csproj" />
       <ProjectReference Include="..\..\processes\Mailing.Library\Mailing.Library.csproj" />
diff --git a/src/registration/ApplicationActivation.Library/ApplicationActivationService.cs b/src/registration/ApplicationActivation.Library/ApplicationActivationService.cs
index 12eb85fd3a..9ab5342b1b 100644
--- a/src/registration/ApplicationActivation.Library/ApplicationActivationService.cs
+++ b/src/registration/ApplicationActivation.Library/ApplicationActivationService.cs
@@ -19,6 +19,7 @@
 
 using Microsoft.Extensions.Options;
 using Org.Eclipse.TractusX.Portal.Backend.ApplicationActivation.Library.DependencyInjection;
+using Org.Eclipse.TractusX.Portal.Backend.Bpdm.Library;
 using Org.Eclipse.TractusX.Portal.Backend.Custodian.Library;
 using Org.Eclipse.TractusX.Portal.Backend.Framework.Async;
 using Org.Eclipse.TractusX.Portal.Backend.Framework.DateTimeProvider;
@@ -43,6 +44,7 @@ public class ApplicationActivationService(
     IProvisioningManager provisioningManager,
     IDateTimeProvider dateTime,
     ICustodianService custodianService,
+    IBpdmService bpdmService,
     IMailingProcessCreation mailingProcessCreation,
     IOptions<ApplicationActivationSettings> options)
     : IApplicationActivationService
@@ -288,6 +290,26 @@ await provisioningManager.DeleteClientRolesFromCentralUserAsync(iamUserId, roleN
             {
                 entry.Comment = resultMessage;
             },
+            Enumerable.Repeat(ProcessStepTypeId.SET_CX_MEMBERSHIP_IN_BPDM, 1),
+            null,
+            true,
+            null);
+    }
+
+    public async Task<IApplicationChecklistService.WorkerChecklistProcessStepExecutionResult> SetCxMembership(IApplicationChecklistService.WorkerChecklistProcessStepData context, CancellationToken cancellationToken)
+    {
+        var businessPartnerNumber = await portalRepositories.GetInstance<IApplicationRepository>()
+            .GetBpnForApplicationIdAsync(context.ApplicationId)
+            .ConfigureAwait(ConfigureAwaitOptions.None);
+        if (businessPartnerNumber is null)
+        {
+            throw new ConflictException("BusinessPartnerNumber must be set");
+        }
+
+        var resultMessage = await bpdmService.SetCxMembership(businessPartnerNumber, cancellationToken).ConfigureAwait(ConfigureAwaitOptions.None);
+        return new IApplicationChecklistService.WorkerChecklistProcessStepExecutionResult(
+            ProcessStepStatusId.DONE,
+            null,
             Enumerable.Repeat(ProcessStepTypeId.FINISH_APPLICATION_ACTIVATION, 1),
             null,
             true,
diff --git a/src/registration/ApplicationActivation.Library/IApplicationActivationService.cs b/src/registration/ApplicationActivation.Library/IApplicationActivationService.cs
index be995b33d5..666127b700 100644
--- a/src/registration/ApplicationActivation.Library/IApplicationActivationService.cs
+++ b/src/registration/ApplicationActivation.Library/IApplicationActivationService.cs
@@ -35,5 +35,6 @@ public interface IApplicationActivationService
     Task<IApplicationChecklistService.WorkerChecklistProcessStepExecutionResult> RemoveRegistrationRoles(IApplicationChecklistService.WorkerChecklistProcessStepData context, CancellationToken cancellationToken);
     Task<IApplicationChecklistService.WorkerChecklistProcessStepExecutionResult> SetTheme(IApplicationChecklistService.WorkerChecklistProcessStepData context, CancellationToken cancellationToken);
     Task<IApplicationChecklistService.WorkerChecklistProcessStepExecutionResult> SetMembership(IApplicationChecklistService.WorkerChecklistProcessStepData context, CancellationToken cancellationToken);
+    Task<IApplicationChecklistService.WorkerChecklistProcessStepExecutionResult> SetCxMembership(IApplicationChecklistService.WorkerChecklistProcessStepData context, CancellationToken cancellationToken);
     Task<IApplicationChecklistService.WorkerChecklistProcessStepExecutionResult> SaveApplicationActivationToDatabase(IApplicationChecklistService.WorkerChecklistProcessStepData context, CancellationToken cancellationToken);
 }
diff --git a/tests/administration/Administration.Service.Tests/BusinessLogic/RegistrationBusinessLogicTest.cs b/tests/administration/Administration.Service.Tests/BusinessLogic/RegistrationBusinessLogicTest.cs
index 86bcf45791..88a512a531 100644
--- a/tests/administration/Administration.Service.Tests/BusinessLogic/RegistrationBusinessLogicTest.cs
+++ b/tests/administration/Administration.Service.Tests/BusinessLogic/RegistrationBusinessLogicTest.cs
@@ -693,6 +693,7 @@ public async Task TriggerChecklistAsync_WithFailingChecklistServiceCall_ReturnsE
     [InlineData(ApplicationChecklistEntryTypeId.APPLICATION_ACTIVATION, ProcessStepTypeId.RETRIGGER_REMOVE_REGISTRATION_ROLES, ProcessStepTypeId.REMOVE_REGISTRATION_ROLES, ApplicationChecklistEntryStatusId.IN_PROGRESS)]
     [InlineData(ApplicationChecklistEntryTypeId.APPLICATION_ACTIVATION, ProcessStepTypeId.RETRIGGER_SET_THEME, ProcessStepTypeId.SET_THEME, ApplicationChecklistEntryStatusId.IN_PROGRESS)]
     [InlineData(ApplicationChecklistEntryTypeId.APPLICATION_ACTIVATION, ProcessStepTypeId.RETRIGGER_SET_MEMBERSHIP, ProcessStepTypeId.SET_MEMBERSHIP, ApplicationChecklistEntryStatusId.IN_PROGRESS)]
+    [InlineData(ApplicationChecklistEntryTypeId.APPLICATION_ACTIVATION, ProcessStepTypeId.RETRIGGER_SET_CX_MEMBERSHIP_IN_BPDM, ProcessStepTypeId.SET_CX_MEMBERSHIP_IN_BPDM, ApplicationChecklistEntryStatusId.IN_PROGRESS)]
     public async Task TriggerChecklistAsync_WithValidData_ReturnsExpected(ApplicationChecklistEntryTypeId typeId, ProcessStepTypeId stepId, ProcessStepTypeId nextStepId, ApplicationChecklistEntryStatusId statusId)
     {
         // Arrange
@@ -790,6 +791,7 @@ public async Task TriggerChecklistAsync_WithWrongProcessStepForChecklist_ThrowsC
     [InlineData(ApplicationChecklistEntryTypeId.APPLICATION_ACTIVATION, ProcessStepTypeId.RETRIGGER_REMOVE_REGISTRATION_ROLES)]
     [InlineData(ApplicationChecklistEntryTypeId.APPLICATION_ACTIVATION, ProcessStepTypeId.RETRIGGER_SET_THEME)]
     [InlineData(ApplicationChecklistEntryTypeId.APPLICATION_ACTIVATION, ProcessStepTypeId.RETRIGGER_SET_MEMBERSHIP)]
+    [InlineData(ApplicationChecklistEntryTypeId.APPLICATION_ACTIVATION, ProcessStepTypeId.RETRIGGER_SET_CX_MEMBERSHIP_IN_BPDM)]
     public async Task TriggerChecklistAsync_Success(ApplicationChecklistEntryTypeId typeId, ProcessStepTypeId stepId)
     {
         // Arrange
diff --git a/tests/administration/Administration.Service.Tests/Controllers/RegistrationControllerTest.cs b/tests/administration/Administration.Service.Tests/Controllers/RegistrationControllerTest.cs
index 856d684475..d046733623 100644
--- a/tests/administration/Administration.Service.Tests/Controllers/RegistrationControllerTest.cs
+++ b/tests/administration/Administration.Service.Tests/Controllers/RegistrationControllerTest.cs
@@ -359,4 +359,18 @@ public async Task RetriggerDeleteCentralUser_ReturnsExpectedResult()
         A.CallTo(() => _logic.RetriggerDeleteCentralUser(processId)).MustHaveHappenedOnceExactly();
         result.Should().BeOfType<NoContentResult>();
     }
+
+    [Fact]
+    public async Task RetriggerSetCxMembership_ReturnsExpectedResult()
+    {
+        // Arrange
+        var applicationId = _fixture.Create<Guid>();
+
+        // Act
+        var result = await _controller.RetriggerSetCxMembership(applicationId);
+
+        // Assert
+        A.CallTo(() => _logic.TriggerChecklistAsync(applicationId, ApplicationChecklistEntryTypeId.APPLICATION_ACTIVATION, ProcessStepTypeId.RETRIGGER_SET_CX_MEMBERSHIP_IN_BPDM)).MustHaveHappenedOnceExactly();
+        result.Should().BeOfType<NoContentResult>();
+    }
 }
diff --git a/tests/externalsystems/Bpdm.Library/BpdmServiceTests.cs b/tests/externalsystems/Bpdm.Library/BpdmServiceTests.cs
index 785550475c..78b426e284 100644
--- a/tests/externalsystems/Bpdm.Library/BpdmServiceTests.cs
+++ b/tests/externalsystems/Bpdm.Library/BpdmServiceTests.cs
@@ -662,4 +662,50 @@ public async Task GetSharingState_WithInvalidData_ThrowsServiceException()
     }
 
     #endregion
+
+    #region SetCxMembership
+
+    [Fact]
+    public async Task SetCxMembership_WithValidData_DoesNotThrowException()
+    {
+        // Arrange
+        const string bpn = "123";
+        var httpMessageHandlerMock = new HttpMessageHandlerMock(HttpStatusCode.OK);
+        using var httpClient = new HttpClient(httpMessageHandlerMock)
+        {
+            BaseAddress = new Uri("https://base.address.com")
+        };
+        A.CallTo(() => _tokenService.GetAuthorizedClient<BpdmService>(_options.Value, A<CancellationToken>._))
+            .Returns(httpClient);
+        var sut = new BpdmService(_tokenService, _options);
+
+        // Act
+        var result = await sut.SetCxMembership(bpn, CancellationToken.None);
+
+        // Assert
+        result.Should().BeTrue();
+    }
+
+    [Fact]
+    public async Task SetCxMembership_WithInvalidData_ThrowsServiceException()
+    {
+        // Arrange
+        const string bpn = "123";
+        var httpMessageHandlerMock = new HttpMessageHandlerMock(HttpStatusCode.BadRequest);
+        using var httpClient = new HttpClient(httpMessageHandlerMock)
+        {
+            BaseAddress = new Uri("https://base.address.com")
+        };
+        A.CallTo(() => _tokenService.GetAuthorizedClient<BpdmService>(_options.Value, A<CancellationToken>._)).Returns(httpClient);
+        var sut = new BpdmService(_tokenService, _options);
+
+        // Act
+        async Task Act() => await sut.SetCxMembership(bpn, CancellationToken.None);
+
+        // Assert
+        var ex = await Assert.ThrowsAsync<ServiceException>(Act);
+        ex.Message.Should().Contain("bpdm-put-cx-membership");
+    }
+
+    #endregion
 }
diff --git a/tests/processes/ApplicationChecklist.Executor.Tests/ApplicationChecklistHandlerServiceTests.cs b/tests/processes/ApplicationChecklist.Executor.Tests/ApplicationChecklistHandlerServiceTests.cs
index 7911bcc6ba..8def33cbb9 100644
--- a/tests/processes/ApplicationChecklist.Executor.Tests/ApplicationChecklistHandlerServiceTests.cs
+++ b/tests/processes/ApplicationChecklist.Executor.Tests/ApplicationChecklistHandlerServiceTests.cs
@@ -155,6 +155,9 @@ public void GetProcessStepExecution_ExecutableStep_Success(ProcessStepTypeId ste
             case ProcessStepTypeId.SET_MEMBERSHIP:
                 A.CallTo(() => _applicationActivationService.SetMembership(context, A<CancellationToken>._)).MustHaveHappenedOnceExactly();
                 break;
+            case ProcessStepTypeId.SET_CX_MEMBERSHIP_IN_BPDM:
+                A.CallTo(() => _applicationActivationService.SetCxMembership(context, A<CancellationToken>._)).MustHaveHappenedOnceExactly();
+                break;
             case ProcessStepTypeId.FINISH_APPLICATION_ACTIVATION:
                 A.CallTo(() => _applicationActivationService.SaveApplicationActivationToDatabase(context, A<CancellationToken>._)).MustHaveHappenedOnceExactly();
                 break;
@@ -229,6 +232,10 @@ public void GetProcessStepExecution_ExecutableStep_Success(ProcessStepTypeId ste
                 execution.ErrorFunc?.Should().NotBeNull();
                 A.CallTo(() => _checklistService.HandleServiceErrorAsync(error, ProcessStepTypeId.RETRIGGER_SET_MEMBERSHIP)).MustHaveHappenedOnceExactly();
                 break;
+            case ProcessStepTypeId.SET_CX_MEMBERSHIP_IN_BPDM:
+                execution.ErrorFunc?.Should().NotBeNull();
+                A.CallTo(() => _checklistService.HandleServiceErrorAsync(error, ProcessStepTypeId.RETRIGGER_SET_CX_MEMBERSHIP_IN_BPDM)).MustHaveHappenedOnceExactly();
+                break;
             case ProcessStepTypeId.FINISH_APPLICATION_ACTIVATION:
                 execution.ErrorFunc?.Should().BeNull();
                 A.CallTo(() => _checklistService.HandleServiceErrorAsync(A<Exception>._, A<ProcessStepTypeId>._)).MustNotHaveHappened();
diff --git a/tests/registration/ApplicationActivation.Library.Tests/ApplicationActivationTests.cs b/tests/registration/ApplicationActivation.Library.Tests/ApplicationActivationTests.cs
index 933dc8a9f1..0f1599cfbf 100644
--- a/tests/registration/ApplicationActivation.Library.Tests/ApplicationActivationTests.cs
+++ b/tests/registration/ApplicationActivation.Library.Tests/ApplicationActivationTests.cs
@@ -19,6 +19,7 @@
 
 using Microsoft.Extensions.Options;
 using Org.Eclipse.TractusX.Portal.Backend.ApplicationActivation.Library.DependencyInjection;
+using Org.Eclipse.TractusX.Portal.Backend.Bpdm.Library;
 using Org.Eclipse.TractusX.Portal.Backend.Custodian.Library;
 using Org.Eclipse.TractusX.Portal.Backend.Framework.DateTimeProvider;
 using Org.Eclipse.TractusX.Portal.Backend.Framework.ErrorHandling;
@@ -83,6 +84,7 @@ public class ApplicationActivationTests
     private readonly ApplicationActivationService _sut;
     private readonly IDateTimeProvider _dateTimeProvider;
     private readonly ICustodianService _custodianService;
+    private readonly IBpdmService _bpdmService;
 
     public ApplicationActivationTests()
     {
@@ -99,6 +101,7 @@ public ApplicationActivationTests()
         _notificationService = A.Fake<INotificationService>();
         _dateTimeProvider = A.Fake<IDateTimeProvider>();
         _custodianService = A.Fake<ICustodianService>();
+        _bpdmService = A.Fake<IBpdmService>();
         _settings = A.Fake<ApplicationActivationSettings>();
         _processStepRepository = A.Fake<IProcessStepRepository>();
 
@@ -124,7 +127,7 @@ public ApplicationActivationTests()
         A.CallTo(() => portalRepositories.GetInstance<IProcessStepRepository>()).Returns(_processStepRepository);
         A.CallTo(() => options.Value).Returns(_settings);
 
-        _sut = new ApplicationActivationService(portalRepositories, _notificationService, _provisioningManager, _dateTimeProvider, _custodianService, _mailingProcessCreation, options);
+        _sut = new ApplicationActivationService(portalRepositories, _notificationService, _provisioningManager, _dateTimeProvider, _custodianService, _bpdmService, _mailingProcessCreation, options);
     }
 
     #endregion
@@ -599,7 +602,7 @@ public async Task SetMembership_WithValid_ReturnsExpected()
         //Assert
         result.StepStatusId.Should().Be(ProcessStepStatusId.DONE);
         result.ScheduleStepTypeIds.Should().ContainSingle()
-            .And.Satisfy(x => x == ProcessStepTypeId.FINISH_APPLICATION_ACTIVATION);
+            .And.Satisfy(x => x == ProcessStepTypeId.SET_CX_MEMBERSHIP_IN_BPDM);
         result.ModifyChecklistEntry?.Should().NotBeNull();
         result.ModifyChecklistEntry?.Invoke(applicationChecklistEntry);
         applicationChecklistEntry.Comment.Should()
@@ -611,6 +614,39 @@ public async Task SetMembership_WithValid_ReturnsExpected()
 
     #endregion
 
+    #region SET_CX_MEMBERSHIP_IN_BPDM
+
+    [Fact]
+    public async Task SetCxMembership_WithValid_ReturnsExpected()
+    {
+        //Arrange
+        var context = new IApplicationChecklistService.WorkerChecklistProcessStepData(
+            Id,
+            default,
+            Checklist,
+            Enumerable.Empty<ProcessStepTypeId>());
+        var applicationChecklistEntry = new ApplicationChecklistEntry(Id, ApplicationChecklistEntryTypeId.APPLICATION_ACTIVATION, ApplicationChecklistEntryStatusId.TO_DO, DateTimeOffset.UtcNow);
+        A.CallTo(() => _applicationRepository.GetBpnForApplicationIdAsync(Id))
+            .Returns(BusinessPartnerNumber);
+        A.CallTo(() => _bpdmService.SetCxMembership(BusinessPartnerNumber, A<CancellationToken>._))
+            .Returns(true);
+
+        //Act
+        var result = await _sut.SetCxMembership(context, CancellationToken.None);
+
+        //Assert
+        result.StepStatusId.Should().Be(ProcessStepStatusId.DONE);
+        result.ScheduleStepTypeIds.Should().ContainSingle()
+            .And.Satisfy(x => x == ProcessStepTypeId.FINISH_APPLICATION_ACTIVATION);
+        result.ModifyChecklistEntry?.Should().NotBeNull();
+        result.ModifyChecklistEntry?.Invoke(applicationChecklistEntry);
+        result.SkipStepTypeIds.Should().BeNull();
+        result.Modified.Should().BeTrue();
+        result.ProcessMessage.Should().BeNull();
+    }
+
+    #endregion
+
     #region FINISH_APPLICATION_ACTIVATION
 
     [Fact]