How To Fix /IWBEP/CM_V4_MED374 - Complex property '&1' (Entity Specific Type '&2') can not be a collection

SAP Error Message - Details

• Message type: E = Error

• Message class: /IWBEP/CM_V4_MED -

• Message number: 374

• Message text: Complex property '&1' (Entity Specific Type '&2') can not be a collection

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message /IWBEP/CM_V4_MED374 - Complex property '&1' (Entity Specific Type '&2') can not be a collection ?

  The SAP error message /IWBEP/CM_V4_MED374 indicates that there is an issue with the definition of a complex property in an OData service. Specifically, it states that a complex property cannot be a collection, which means that the property in question is defined as a complex type but is being treated as if it were a collection (array) of complex types.
  Cause:
  
  Incorrect Data Model Definition: The error typically arises when the data model defined in the OData service has a complex property that is mistakenly defined as a collection. In OData, complex types can contain properties but cannot themselves be collections.
  Service Implementation Issues: If the service implementation is trying to return a collection of complex types where a single complex type is expected, this will trigger the error.
  Metadata Mismatch: There may be a mismatch between the metadata definition and the actual data being returned by the service.
  
  Solution:
  
  
  Check the Data Model: Review the definition of the entity type in the OData service. Ensure that the complex property is defined correctly. If it is meant to be a single complex type, it should not be defined as a collection.
  
  In the service definition, ensure that the property is defined as a complex type and not as a collection of complex types.
  
  
  
  Adjust the Service Implementation: If the service is returning a collection of complex types, modify the implementation to return a single instance of the complex type instead.
  
  Ensure that the logic in the service handler correctly constructs and returns the expected data structure.
  
  
  
  Update Metadata: If changes are made to the data model or service implementation, regenerate the metadata for the OData service to ensure that it reflects the current definitions.
  
  
  Testing: After making the necessary changes, test the OData service to ensure that the error no longer occurs and that the expected data is returned correctly.
  
  
  Related Information:
  
  OData Specification: Familiarize yourself with the OData specification regarding complex types and collections. Understanding the rules around these definitions can help prevent similar issues in the future.
  SAP Documentation: Refer to SAP's official documentation for OData services and the specific error message for more detailed guidance and examples.
  Debugging Tools: Use debugging tools available in SAP (like transaction codes SE80, SE11, or SE37) to analyze the service implementation and data model definitions.
  
  By following these steps, you should be able to resolve the error and ensure that your OData service is functioning correctly.