How To Fix /IWBEP/CM_V4S_RUN009 - Complex collection not supported as return type

SAP Error Message - Details

• Message type: E = Error

• Message class: /IWBEP/CM_V4S_RUN -

• Message number: 009

• Message text: Complex collection not supported as return type

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message /IWBEP/CM_V4S_RUN009 - Complex collection not supported as return type ?

  The SAP error message /IWBEP/CM_V4S_RUN009 indicates that a complex collection is not supported as a return type in the context of an OData service. This typically occurs when you are trying to return a collection of complex types from an OData service, which is not allowed in certain scenarios.
  Cause:
  
  Complex Types in OData: In OData, complex types can be used to represent structured data, but they cannot be returned as a collection directly in certain contexts. The OData protocol has specific rules about how complex types can be used, and returning a collection of complex types may not be supported in the version or configuration you are using.
  Service Definition: The OData service might be incorrectly defined, where the return type of an operation is set to a complex collection instead of a simple entity or a primitive type.
  Implementation Issues: There may be issues in the implementation of the service or the way the data is being fetched and returned.
  
  Solution:
  
  Change Return Type: Modify the return type of the OData service operation to return a simple entity type instead of a complex collection. If you need to return structured data, consider returning a single entity that contains the complex type as a property.
  Use Entity Types: If you need to return multiple records, consider using entity types instead of complex types. Entity types can be returned as collections.
  Check Service Metadata: Review the service metadata (EDMX or service document) to ensure that the return types are correctly defined and that you are not trying to return a complex collection where it is not supported.
  Update OData Version: If you are using an older version of OData, consider updating to a newer version that may have better support for complex types and collections.
  Debugging: Use debugging tools to trace the execution of the OData service and identify where the return type is being set incorrectly.
  
  Related Information:
  
  OData Protocol: Familiarize yourself with the OData protocol specifications, especially regarding complex types and entity types. The official OData documentation can provide insights into how to structure your data models.
  SAP Notes: Check SAP Notes and Knowledge Base Articles for any known issues or updates related to this error message. SAP frequently updates its documentation and provides fixes for common issues.
  Community Forums: Engage with the SAP community forums or Stack Overflow to see if others have encountered similar issues and what solutions they have found.
  
  By addressing the return type and ensuring that your OData service is correctly defined, you should be able to resolve the error message /IWBEP/CM_V4S_RUN009.