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

/IWBEP/CM_V4S_RUN009 - Overview

• 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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/IWBEP/CM_V4S_RUN009 - Details

• 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