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

/IWBEP/SBOD139 - Overview

• 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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/IWBEP/SBOD139 - Details

• 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