How To Fix /IWBEP/CM_V4_RUNTIME102 - Complex property has wrong multiplicity for the new message target

SAP Error Message - Details

• Message type: E = Error

• Message class: /IWBEP/CM_V4_RUNTIME -

• Message number: 102

• Message text: Complex property has wrong multiplicity for the new message target

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message /IWBEP/CM_V4_RUNTIME102 - Complex property has wrong multiplicity for the new message target ?

  The SAP error message /IWBEP/CM_V4_RUNTIME102 indicates that there is a problem with the multiplicity of a complex property in an OData service. This error typically arises when the data model defined in the OData service does not match the expected structure or constraints defined in the service's metadata.
  Cause:
  
  
  Multiplicity Mismatch: The error usually occurs when the OData service expects a certain multiplicity (e.g., 0..1, 1..1, 0..n, 1..n) for a complex property, but the actual data being sent does not conform to this expectation. For example, if a complex type is defined to allow only one instance but the incoming message contains multiple instances, this error will be triggered.
  
  
  Incorrect Data Structure: The structure of the JSON or XML payload being sent to the OData service may not match the expected structure defined in the service's metadata. This can happen if the payload is incorrectly formatted or if it includes unexpected properties.
  
  
  Service Definition Issues: There may be issues in the service definition itself, such as incorrect annotations or definitions in the OData model.
  
  
  Solution:
  
  
  Check the OData Service Metadata: Review the metadata of the OData service to understand the expected structure and multiplicity of the complex properties. You can access the metadata by appending $metadata to the service URL.
  
  
  Validate the Payload: Ensure that the payload being sent to the OData service matches the expected structure. Pay special attention to the complex properties and their multiplicities. If a property is defined as a complex type with a multiplicity of 1, ensure that you are sending exactly one instance of that complex type.
  
  
  Adjust the Data Model: If the data model needs to be changed to accommodate the incoming data, consider modifying the OData service definition to reflect the correct multiplicity. This may involve changing the annotations or the structure of the entity types.
  
  
  Debugging: Use debugging tools or logs to trace the incoming request and identify where the mismatch occurs. This can help pinpoint the exact property causing the issue.
  
  
  Testing: After making changes, test the OData service with various payloads to ensure that it handles the expected data correctly and does not produce the error.
  
  
  Related Information:
  
  OData Version: Ensure that you are aware of the OData version being used, as different versions may have different rules regarding data structures and multiplicities.
  SAP Notes: Check for any relevant SAP Notes or documentation that may provide additional insights or solutions related to this error.
  Community Forums: Consider reaching out to SAP community forums or support channels for assistance, as other users may have encountered similar issues.
  
  By following these steps, you should be able to identify the cause of the error and implement a solution to resolve it.