diff --git a/openbas-api/src/main/java/io/openbas/migration/V3_54__Alter_xls_mapper_table.java b/openbas-api/src/main/java/io/openbas/migration/V3_54__Alter_xls_mapper_table.java
new file mode 100644
index 0000000000..056bdd5eff
--- /dev/null
+++ b/openbas-api/src/main/java/io/openbas/migration/V3_54__Alter_xls_mapper_table.java
@@ -0,0 +1,24 @@
+package io.openbas.migration;
+
+import java.sql.Connection;
+import java.sql.Statement;
+import org.flywaydb.core.api.migration.BaseJavaMigration;
+import org.flywaydb.core.api.migration.Context;
+import org.springframework.stereotype.Component;
+
+@Component
+public class V3_54__Alter_xls_mapper_table extends BaseJavaMigration {
+
+  @Override
+  public void migrate(Context context) throws Exception {
+    Connection connection = context.getConnection();
+    Statement statement = connection.createStatement();
+
+    statement.execute(
+        "ALTER TABLE inject_importers alter column importer_mapper_id drop not null;");
+    statement.execute(
+        "ALTER TABLE inject_importers alter column importer_injector_contract_id drop not null;");
+    statement.execute(
+        "ALTER TABLE rule_attributes alter column attribute_inject_importer_id drop not null;");
+  }
+}
diff --git a/openbas-model/src/main/java/io/openbas/database/model/InjectImporter.java b/openbas-model/src/main/java/io/openbas/database/model/InjectImporter.java
index 203d862d55..1de914e280 100644
--- a/openbas-model/src/main/java/io/openbas/database/model/InjectImporter.java
+++ b/openbas-model/src/main/java/io/openbas/database/model/InjectImporter.java
@@ -37,7 +37,7 @@ public class InjectImporter implements Base {
   @NotBlank
   private String importTypeValue;
 
-  @OneToOne(cascade = CascadeType.ALL, orphanRemoval = true)
+  @OneToOne
   @JoinColumn(name = "importer_injector_contract_id")
   @JsonProperty("inject_importer_injector_contract")
   @JsonSerialize(using = MonoIdDeserializer.class)