How To Fix /IWBEP/CM_V4_RUNTIME136 - Target parameter '&1' must be complex collection

SAP Error Message - Details

• Message type: E = Error

• Message class: /IWBEP/CM_V4_RUNTIME -

• Message number: 136

• Message text: Target parameter '&1' must be complex collection

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message /IWBEP/CM_V4_RUNTIME136 - Target parameter '&1' must be complex collection ?

  The SAP error message /IWBEP/CM_V4_RUNTIME136 indicates that there is an issue with the data structure being used in an OData service. Specifically, the error message states that the target parameter must be a complex collection, which means that the expected data type for the parameter is a collection of complex types, but the provided data does not meet this requirement.
  Cause:
  
  Incorrect Data Structure: The most common cause of this error is that the OData service is expecting a complex collection (a collection of objects with multiple properties), but the data being sent is either a simple type or a flat structure.
  Service Definition Mismatch: There may be a mismatch between the service definition (in the metadata) and the actual data being sent in the request.
  Improper Mapping: If the OData model is not properly defined or mapped, it can lead to this error when the service tries to process the incoming request.
  
  Solution:
  
  Check the OData Service Definition: Review the metadata of the OData service to ensure that the target parameter is indeed defined as a complex collection. You can do this by accessing the service's metadata URL (usually ends with $metadata).
  Validate the Request Payload: Ensure that the request payload being sent to the OData service matches the expected structure. If the service expects a complex collection, make sure you are sending an array of objects with the required properties.
  Adjust the Data Format: If you are sending data from a frontend application or another service, ensure that the data is formatted correctly as a complex collection. For example, if the expected format is:
  {
      "Items": [
          {
              "Property1": "Value1",
              "Property2": "Value2"
          },
          {
              "Property1": "Value3",
              "Property2": "Value4"
          }
      ]
  }
  Ensure that your request matches this structure.
  
  Debugging: Use tools like Postman or Fiddler to inspect the request being sent to the OData service. This can help identify if the structure is incorrect.
  Consult Documentation: Refer to the SAP documentation for the specific OData service you are using to understand the expected input format.
  
  Related Information:
  
  OData Protocol: Understanding the OData protocol and how it handles complex types and collections can be beneficial. OData supports various data types, and knowing how to structure your requests is crucial.
  SAP Gateway: If you are working with SAP Gateway, familiarize yourself with the concepts of entity types, complex types, and collections in the context of OData services.
  Error Handling: Implement error handling in your application to gracefully manage such errors and provide meaningful feedback to users.
  
  By following these steps, you should be able to resolve the error and ensure that your OData service processes requests correctly.