How To Fix /IWBEP/CM_V4_MED252 - Return type kind of operation '&1' already set

/IWBEP/CM_V4_MED252 - Overview

• Message type: E = Error

• Message class: /IWBEP/CM_V4_MED -

• Message number: 252

• Message text: Return type kind of operation '&1' already set

Self-Explanatory Message

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/IWBEP/CM_V4_MED252 - Details

• The SAP error message /IWBEP/CM_V4_MED252 indicates that there is an issue with the return type of an operation in an OData service. Specifically, it suggests that the return type for a particular operation has already been defined, and an attempt is being made to set it again, which is not allowed.
  
  Cause:
  
  Duplicate Return Type Definition: The error typically occurs when the return type for an OData operation (like a GET, POST, PUT, DELETE) is being set multiple times in the service definition.
  Incorrect Service Implementation: If the service implementation is trying to redefine the return type after it has already been set, this will trigger the error.
  Model 
  Configuration Issues: There may be issues in the way the OData model is configured, leading to conflicts in return type definitions.
  
  
  Solution:
  
  Check the Service Definition: Review the OData service definition in the SAP Gateway Service Builder (transaction code SEGW). Ensure that each operation has a return