How To Fix /IWBEP/CM_V4_RUNTIME020 - Data service request is required to be conditional; try using If-Match

SAP Error Message - Details

• Message type: E = Error

• Message class: /IWBEP/CM_V4_RUNTIME -

• Message number: 020

• Message text: Data service request is required to be conditional; try using If-Match

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message /IWBEP/CM_V4_RUNTIME020 - Data service request is required to be conditional; try using If-Match ?

  The SAP error message /IWBEP/CM_V4_RUNTIME020 indicates that a data service request is required to be conditional, and it suggests using the If-Match header. This error typically occurs in the context of OData services when a client attempts to perform an operation (like an update or delete) on a resource without providing the necessary conditional headers.
  Cause:
  The error is caused by the following scenarios:
  
  Missing Conditional Header: The request does not include the If-Match header, which is necessary for conditional requests. This header is used to ensure that the operation is performed only if the resource has not been modified since the client last retrieved it.
  Optimistic Locking: The OData service is configured to use optimistic locking, which requires the client to provide the current version of the resource (usually in the form of an ETag) to prevent overwriting changes made by other clients.
  
  Solution:
  To resolve this error, you can take the following steps:
  
  
  Include the If-Match Header: Modify your request to include the If-Match header with the appropriate ETag value. The ETag is typically retrieved when you first read the resource. For example:
  If-Match: "etag_value"
  Replace "etag_value" with the actual ETag you received when you last fetched the resource.
  
  
  Check Resource Version: Ensure that you are using the correct version of the resource. If the resource has been modified since you last retrieved it, you may need to fetch the latest version before attempting to update or delete it.
  
  
  Review OData Service Configuration: If you are the developer or administrator of the OData service, review the service configuration to ensure that it is set up correctly for handling conditional requests.
  
  
  Related Information:
  
  OData Protocol: Understanding the OData protocol and how it handles conditional requests can help in troubleshooting similar issues. The If-Match header is part of the HTTP specification and is used to implement optimistic concurrency control.
  ETag: An ETag (Entity Tag) is a unique identifier assigned to a specific version of a resource. It is used in HTTP caching and conditional requests to determine if the resource has changed.
  SAP Documentation: Refer to the official SAP documentation for OData services and the specific service you are working with for more detailed information on handling requests and responses.
  
  By following these steps and understanding the underlying concepts, you should be able to resolve the error and successfully perform the desired operation on the OData service.