How To Fix /IWBEP/SBOD139 - Function Import '&1': Return Cardinality 0..1 is not recommended

SAP Error Message - Details

• Message type: E = Error

• Message class: /IWBEP/SBOD -

• Message number: 139

• Message text: Function Import '&1': Return Cardinality 0..1 is not recommended

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message /IWBEP/SBOD139 - Function Import '&1': Return Cardinality 0..1 is not recommended ?

  The SAP error message /IWBEP/SBOD139 Function Import '&1': Return Cardinality 0..1 is not recommended typically occurs in the context of SAP Gateway and OData services. This error indicates that a function import in your OData service is defined with a return cardinality of 0..1, which is not recommended for certain scenarios, particularly when the function is expected to return a collection or multiple records.
  Cause:
  
  Return Cardinality Misconfiguration: The function import is defined to return a single entity or no entity (0..1), but the logic or the expected behavior of the function suggests that it should return multiple entities (1..n).
  OData Specification: According to OData specifications, function imports that are expected to return a collection should have a return cardinality of 1..n instead of 0..1.
  
  Solution:
  
  Review Function Import Definition: Check the definition of the function import in the OData service. If the function is intended to return multiple records, change the return type to reflect that (e.g., change from 0..1 to 1..n).
  Adjust Logic: If the function is indeed meant to return a single record or none, ensure that the logic within the function is correctly implemented to handle that scenario.
  Update Service Metadata: After making changes to the function import, regenerate the service metadata and re-activate the OData service to ensure that the changes take effect.
  Testing: Test the function import after making the changes to ensure that it behaves as expected and does not produce any further errors.
  
  Related Information:
  
  OData Documentation: Refer to the official OData documentation for guidelines on defining function imports and their return types.
  SAP Gateway: Familiarize yourself with SAP Gateway concepts, especially how OData services are structured and how function imports are defined.
  Debugging: Use transaction codes like /IWFND/ERROR_LOG to check for additional error messages or logs that might provide more context on the issue.
  
  By addressing the return cardinality and ensuring that it aligns with the expected behavior of the function import, you should be able to resolve the error message.