How To Fix /IWBEP/CM_V4_RUNTIME049 - If-Unmodified-Since has not been processed

SAP Error Message - Details

• Message type: E = Error

• Message class: /IWBEP/CM_V4_RUNTIME -

• Message number: 049

• Message text: If-Unmodified-Since has not been processed

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message /IWBEP/CM_V4_RUNTIME049 - If-Unmodified-Since has not been processed ?

  The SAP error message /IWBEP/CM_V4_RUNTIME049 If-Unmodified-Since has not been processed typically occurs in the context of OData services when there is an issue with the handling of the If-Unmodified-Since HTTP header. This header is used in HTTP requests to ensure that the resource being modified has not been changed since the specified date and time. If the resource has been modified, the server should reject the request.
  Cause:
  
  
  Missing or Incorrect Implementation: The OData service may not be correctly implemented to handle the If-Unmodified-Since header. This could be due to missing logic in the service that checks the timestamp against the last modified date of the resource.
  
  
  Resource Not Found: The resource being accessed may not exist, leading to the inability to check the modification date.
  
  
  Service Configuration: The OData service might not be configured to support optimistic concurrency control, which is what the If-Unmodified-Since header is part of.
  
  
  Incorrect Header Value: The value provided in the If-Unmodified-Since header may not be in the correct format or may not correspond to any existing modification date.
  
  
  Solution:
  
  
  Check Service Implementation: Review the implementation of the OData service to ensure that it correctly processes the If-Unmodified-Since header. Ensure that the logic to compare the provided timestamp with the resource's last modified timestamp is in place.
  
  
  Verify Resource Existence: Ensure that the resource you are trying to modify exists and is accessible. If it does not exist, you will need to create it first.
  
  
  Service Configuration: Check the configuration of the OData service to ensure that it supports optimistic concurrency control. This may involve settings in the service definition or annotations.
  
  
  Correct Header Value: Ensure that the value being sent in the If-Unmodified-Since header is correctly formatted and corresponds to the last modified date of the resource. The format should typically be in RFC 1123 format (e.g., Wed, 21 Oct 2015 07:28:00 GMT).
  
  
  Debugging: If the issue persists, consider enabling debugging or logging for the OData service to capture more detailed information about the request and the processing of the If-Unmodified-Since header.
  
  
  Related Information:
  
  OData Protocol: Understanding the OData protocol and how it handles concurrency control can provide insights into how to properly implement and troubleshoot issues related to the If-Unmodified-Since header.
  SAP Notes: Check for any relevant SAP Notes or documentation that may address known issues or provide guidance on implementing OData services with concurrency control.
  Community Forums: Engaging with SAP community forums or support channels can also provide additional insights and solutions from other users who 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.