How To Fix /IWBEP/CM_MGW_RT019 - Function import '&1' cannot use return type '&2' if no data is returned

/IWBEP/CM_MGW_RT019 - Overview

• Message type: E = Error

• Message class: /IWBEP/CM_MGW_RT -

• Message number: 019

• Message text: Function import '&1' cannot use return type '&2' if no data is returned

Self-Explanatory Message

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/IWBEP/CM_MGW_RT019 - Details

• The SAP error message /IWBEP/CM_MGW_RT019 typically occurs in the context of SAP Gateway and OData services when a function import is defined to return a specific data type, but the actual implementation does not return any data. This can lead to a mismatch between the expected return type and the actual return value.
  
  Cause:
  
  Mismatch in Return Type: The function import is defined to return a specific type (e.g., an entity type or a complex type), but the implementation does not return any data (e.g., it returns an empty response or a different type).
  Incorrect Implementation: The logic in the function import implementation may not be correctly set up to return the expected data.
  Service Definition Issues: The OData service definition may not align with the actual implementation, leading to discrepancies in expected and returned data types.
  
  
  Solution:
  
  Check Function Import Definition: Review the function import definition in the OData service to ensure that the return