How To Fix SADL_ENTITY_RUNTIME004 - Precondition required for entity &1~&2 (If-Match missing)

SAP Error Message - Details

• Message type: E = Error

• Message class: SADL_ENTITY_RUNTIME - Messages of SADL runtime and DDIC SADL entity runtime

• Message number: 004

• Message text: Precondition required for entity &1~&2 (If-Match missing)

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message SADL_ENTITY_RUNTIME004 - Precondition required for entity &1~&2 (If-Match missing) ?

  The SAP error message SADL_ENTITY_RUNTIME004 indicates that a precondition required for the entity operation is missing, specifically the If-Match header. This error typically occurs in the context of OData services when trying to perform an update or delete operation on an entity.
  Cause:
  The error arises when the OData service expects an If-Match header to be included in the request, but it is missing. The If-Match header is used to ensure that the operation is only performed if the entity has not been modified since it was last retrieved. This is a part of optimistic concurrency control, which helps prevent overwriting changes made by other users.
  Solution:
  To resolve this error, you need to ensure that the If-Match header is included in your request when performing update or delete operations. Here’s how you can do that:
  
  
  Retrieve the Entity: First, you need to retrieve the entity you want to update or delete. This will give you the current ETag (entity tag) value associated with that entity.
  
  
  Include the If-Match Header: When you send the update or delete request, include the If-Match header with the ETag value you retrieved. The header should look like this:
  If-Match: "etag_value"
  Replace "etag_value" with the actual ETag value you obtained from the previous retrieval.
  
  
  Check for Correctness: Ensure that the ETag value is correctly formatted and corresponds to the entity you are trying to modify.
  
  
  Related Information:
  
  ETag: An ETag is a unique identifier assigned to a specific version of a resource. It is used in HTTP to manage cache and concurrency.
  OData Protocol: OData (Open Data Protocol) is a standard protocol for building and consuming RESTful APIs. Understanding OData conventions can help in troubleshooting similar issues.
  SAP Gateway: If you are working with SAP Gateway services, familiarize yourself with how it handles OData requests and the importance of headers like If-Match.
  
  Additional Tips:
  
  If you are using a tool or library to make OData requests, check its documentation for how to set headers.
  If you are developing an application, ensure that your code correctly handles the retrieval and inclusion of ETags in requests.
  Review the SAP documentation or community forums for any specific configurations or known issues related to the OData service you are using.
  
  By following these steps, you should be able to resolve the SADL_ENTITY_RUNTIME004 error and successfully perform the desired operation on the entity.