diff --git a/proto/cmp/services/activity/v1alpha1/search_parameters_types.proto b/proto/cmp/services/activity/v1alpha1/search_parameters_types.proto
index cc3fd989..abbcb9e8 100644
--- a/proto/cmp/services/activity/v1alpha1/search_parameters_types.proto
+++ b/proto/cmp/services/activity/v1alpha1/search_parameters_types.proto
@@ -5,6 +5,7 @@ package cmp.services.activity.v1alpha1;
 import "cmp/types/v1alpha1/language.proto";
 import "cmp/types/v1alpha1/time.proto";
 import "cmp/types/v1alpha1/price.proto";
+import "cmp/types/v1alpha1/product_code.proto";
 
 // ### Activity Search Parameters
 //
@@ -21,7 +22,7 @@ message ActivitySearchParameters {
   // Specify one or more product codes to be included in the search response 
   //
   // Ex: "TC000000"
-  repeated string product_code = 2;
+  repeated cmp.types.v1alpha1.ProductCode product_codes = 2;
 
   // Specify one or more activity IDs to be included in the search response
   //
diff --git a/proto/cmp/services/transport/v1alpha1/search_parameters_types.proto b/proto/cmp/services/transport/v1alpha1/search_parameters_types.proto
index a2c7a21b..abf1ca09 100644
--- a/proto/cmp/services/transport/v1alpha1/search_parameters_types.proto
+++ b/proto/cmp/services/transport/v1alpha1/search_parameters_types.proto
@@ -4,6 +4,7 @@ package cmp.services.transport.v1alpha1;
 
 import "cmp/types/v1alpha1/time.proto";
 import "cmp/types/v1alpha1/price.proto";
+import "cmp/types/v1alpha1/product_code.proto";
 
 // ### Transport Search Parameters
 //
@@ -12,7 +13,7 @@ import "cmp/types/v1alpha1/price.proto";
 message TransportSearchParameters {
   // Specify one or more type codes to be included in the search response
   // Ex: "SF"
-  repeated string product_code = 1;
+  repeated cmp.types.v1alpha1.ProductCode product_codes = 1;
 
   // Duration
   // Specify the minimal and maximum duration of an activity to be included in the search response