How To Fix /IWBEP/CM_V4_RUNTIME138 - Target parameter '&1' must be entity collection

SAP Error Message - Details

• Message type: E = Error

• Message class: /IWBEP/CM_V4_RUNTIME -

• Message number: 138

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

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message /IWBEP/CM_V4_RUNTIME138 - Target parameter '&1' must be entity collection ?

  The SAP error message /IWBEP/CM_V4_RUNTIME138 indicates that there is an issue with the target parameter in an OData service call. Specifically, the error message states that the target parameter &1 must be an entity collection. This typically occurs when the OData service is expecting a collection of entities (like a list of records) but is instead receiving a single entity or an incorrect data type.
  Cause:
  
  Incorrect URL or Request Format: The request might be incorrectly formatted, leading to the service expecting a collection but receiving a single entity instead.
  Service Definition Issues: The OData service might be incorrectly defined, where the expected entity set is not properly configured.
  Data Model Mismatch: There could be a mismatch between the data model defined in the service and the actual data being sent in the request.
  Client-Side Issues: The client application making the OData call might be incorrectly constructing the request.
  
  Solution:
  
  
  Check the OData Request: Ensure that the request URL is correctly formatted and that it is targeting an entity collection. For example, if you are trying to access a collection, the URL should look something like /EntitySetName instead of /EntitySetName(EntityID).
  
  
  Review Service Metadata: Use the $metadata endpoint of your OData service to review the entity sets and ensure that you are targeting the correct entity collection.
  
  
  Adjust the Client Code: If you are using a client application (like SAP Fiori, SAP UI5, or any other OData client), check the code that constructs the OData request. Make sure it is set up to call the correct entity collection.
  
  
  Debugging: If you have access to the backend, you can debug the OData service to see what parameters are being received and how they are being processed.
  
  
  Consult Documentation: Refer to the SAP documentation for the specific OData service you are using to ensure that you are following the correct conventions and practices.
  
  
  Related Information:
  
  OData Protocol: Understanding the OData protocol can help in diagnosing issues related to entity collections and service calls.
  SAP Gateway: If you are working with SAP Gateway services, familiarize yourself with the service builder and how to define entity sets and their relationships.
  Error Handling: Implement error handling in your client application to gracefully manage and log errors when they occur.
  
  By following these steps, you should be able to identify the cause of the error and implement a solution to resolve it.