How To Fix /IWBEP/CM_V4_RUNTIME132 - Target property '&1' must be a collection

SAP Error Message - Details

• Message type: E = Error

• Message class: /IWBEP/CM_V4_RUNTIME -

• Message number: 132

• Message text: Target property '&1' must 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_RUNTIME132 - Target property '&1' must be a collection ?

  The SAP error message /IWBEP/CM_V4_RUNTIME132 indicates that there is an issue with the data model in an OData service, specifically that a target property is expected to be a collection (like an array or list) but is not defined as such. This error typically arises in the context of OData services developed using the SAP Gateway framework.
  Cause:
  
  Data Model Definition: The target property in the OData service is defined as a single value instead of a collection. This can happen if the metadata definition (EDMX or similar) does not correctly specify the property as a collection.
  Service Implementation: The implementation of the service might be returning a single object instead of a collection when the OData service expects a collection.
  Incorrect Mapping: There might be a mismatch between the data model and the actual data being returned by the service.
  
  Solution:
  
  
  Check Metadata Definition:
  
  Review the OData service's metadata (EDMX file) to ensure that the target property is defined as a collection. For example, it should be defined as Collection(TypeName) instead of just TypeName.
  If it is not defined correctly, you will need to modify the data model to reflect that the property is a collection.
  
  
  
  Adjust Service Implementation:
  
  Ensure that the service implementation returns a collection for the target property. If the logic is returning a single object, modify it to return a list or array of objects.
  For example, if you are using ABAP to implement the service, ensure that the data being returned is in the correct format (e.g., using APPEND to add items to an internal table).
  
  
  
  Test the Service:
  
  After making changes, test the OData service using tools like Postman or the SAP Gateway Client to ensure that the service now returns the expected collection.
  
  
  
  Regenerate the Service:
  
  If you made changes to the data model, you may need to regenerate the service and re-activate it in the SAP Gateway.
  
  
  
  Check for Related Errors:
  
  Look for any other related error messages that might provide additional context or indicate other issues in the service.
  
  
  
  Related Information:
  
  OData Services: Understanding how OData services work in SAP, including the structure of the service and how to define entities and collections.
  SAP Gateway: Familiarity with the SAP Gateway framework and how to implement and troubleshoot OData services.
  Debugging: Use debugging tools in SAP (like transaction /IWFND/ERROR_LOG) to get more details about the error and the context in which it occurred.
  
  By following these steps, you should be able to resolve the error and ensure that your OData service functions correctly.