How To Fix /IWBEP/CM_V4_RUNTIME130 - Target property '&1' must not be a collection

SAP Error Message - Details

• Message type: E = Error

• Message class: /IWBEP/CM_V4_RUNTIME -

• Message number: 130

• Message text: Target property '&1' must not be a collection

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

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Smart SAP Assistant

• What is the cause and solution for SAP error message /IWBEP/CM_V4_RUNTIME130 - Target property '&1' must not be a collection ?

  The SAP error message /IWBEP/CM_V4_RUNTIME130 Target property '&1' must not be a collection typically occurs in the context of SAP Gateway and OData services. This error indicates that there is an issue with the way the OData service is trying to map or handle a property that is expected to be a single value but is being treated as a collection (array or list).
  Cause:
  
  Incorrect Data Model Definition: The OData service is trying to map a property that is defined as a collection in the data model, but the target property in the entity is defined as a single value.
  Service Implementation Error: The implementation of the service might be incorrectly returning a collection for a property that should only return a single value.
  Metadata Mismatch: There could be a mismatch between the metadata definition of the OData service and the actual data being returned or expected.
  
  Solution:
  
  Check the Data Model: Review the data model definition in the OData service. Ensure that the property in question is defined correctly as a single value if that is the intended design.
  Review the Service Implementation: Look at the implementation of the OData service (e.g., the method that handles the request). Ensure that it returns a single value for the property in question and not a collection.
  Update Metadata: If there have been changes to the data model, ensure that the metadata is updated accordingly. You may need to regenerate the service or refresh the metadata.
  Debugging: Use debugging tools to trace the execution of the OData service and see where the collection is being returned instead of a single value. This can help identify the root cause of the issue.
  Check Annotations: If you are using annotations, ensure that they are correctly defined and do not imply that the property is a collection when it should not be.
  
  Related Information:
  
  OData Service Documentation: Review the official SAP documentation on OData services and the specific version you are using to understand the expected behavior and definitions.
  SAP Community: Check forums and community discussions for similar issues. Other developers may have encountered the same error and shared their solutions.
  SAP Notes: Look for any relevant SAP Notes that might address this specific error or provide guidance on best practices for defining OData services.
  
  By following these steps, you should be able to identify and resolve the issue causing the error message /IWBEP/CM_V4_RUNTIME130 Target property '&1' must not be a collection.