How To Fix /IWBEP/CM_V4_MED251 - Return of function '&1' not primitive type based

SAP Error Message - Details

• Message type: E = Error

• Message class: /IWBEP/CM_V4_MED -

• Message number: 251

• Message text: Return of function '&1' not primitive type based

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.

Unfortunately, there isn't any extra information in this error notice.

What else can you do?

First, use our AnswerBot below to get a possible cause and solution (requires a premium subscription).

Also, review the in-depth Common Questions & Answers listed below; you could discover a solution there or be able to connect with others who have faced similar challenges.

You can also try searching the SAP support portal (support.sap.com) but you need a special user ID to access it. It is possible that an SAP support note exists that provides additional details about the mistake or even steps for fixing it.

Smart SAP Assistant

• What is the cause and solution for SAP error message /IWBEP/CM_V4_MED251 - Return of function '&1' not primitive type based ?

  The SAP error message /IWBEP/CM_V4_MED251 indicates that there is an issue with the return type of a function in an OData service. Specifically, the error states that the return type of the function is not a primitive type based on the OData V4 specifications. This typically occurs when the function is expected to return a primitive type (like string, integer, etc.), but it is returning a complex type or an unsupported type instead.
  Cause:
  
  Return Type Mismatch: The function is defined to return a primitive type, but the actual return type is a complex type or a collection.
  Service Definition Issues: The OData service might be incorrectly defined in the service metadata, leading to this mismatch.
  Implementation Errors: The implementation of the function might not align with the expected return type defined in the service.
  
  Solution:
  
  Check Function Definition: Review the function definition in the OData service. Ensure that the return type is correctly defined as a primitive type.
  Modify Implementation: If the function is implemented in ABAP or another language, ensure that the return statement is returning a primitive type. If it needs to return a complex type, consider changing the function definition to reflect that.
  Update Service Metadata: If changes are made to the function or its implementation, regenerate the service metadata to ensure that it reflects the current definitions.
  Test the Function: After making the necessary changes, test the function again to ensure that it now returns the expected primitive type.
  
  Related Information:
  
  OData V4 Specifications: Familiarize yourself with the OData V4 specifications regarding primitive and complex types to understand the requirements for function return types.
  SAP Gateway: If you are using SAP Gateway, check the service implementation and the associated data model to ensure consistency.
  Debugging: Use debugging tools in SAP to trace the execution of the function and verify the return type at runtime.
  
  If the issue persists after following these steps, consider consulting SAP documentation or reaching out to SAP support for further assistance.