How To Fix /FTI/SERV_TECH_ERROR059 - Key changes are only permitted for entities with an ETag

SAP Error Message - Details

• Message type: E = Error

• Message class: /FTI/SERV_TECH_ERROR -

• Message number: 059

• Message text: Key changes are only permitted for entities with an ETag

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

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Smart SAP Assistant

• What is the cause and solution for SAP error message /FTI/SERV_TECH_ERROR059 - Key changes are only permitted for entities with an ETag ?

  The SAP error message /FTI/SERV_TECH_ERROR059 indicates that there is an issue related to the handling of entities in the SAP system, specifically regarding the use of ETags (Entity Tags). This error typically arises when you attempt to make changes to an entity that does not have a valid ETag associated with it. ETags are used in web services and APIs to manage concurrency and ensure that updates are made to the correct version of a resource.
  Cause:
  
  Missing ETag: The entity you are trying to modify does not have an ETag associated with it. This can happen if the entity was not retrieved properly or if it was created without an ETag.
  Concurrency Issues: The system is designed to prevent updates to entities that may have been modified by another process or user since the last retrieval. If the ETag is missing, the system cannot verify the current state of the entity.
  Incorrect API Usage: The API or service you are using may require an ETag for update operations, and if it is not provided, the operation will fail.
  
  Solution:
  
  Retrieve the Entity with ETag: Ensure that you retrieve the entity you want to modify using a GET request that includes the ETag in the response. This ETag should be included in your subsequent update requests.
  Check API Documentation: Review the API documentation to understand the requirements for ETags and ensure that you are following the correct procedures for retrieving and updating entities.
  Use Correct Update Method: When updating the entity, make sure to include the ETag in the request header (usually in the If-Match header) to indicate that you are updating the specific version of the entity.
  Error Handling: Implement error handling in your application to manage cases where the ETag is missing or does not match, allowing you to retrieve the latest version of the entity before attempting to update it again.
  
  Related Information:
  
  ETag Concept: ETags are part of the HTTP protocol and are used for web cache validation and conditional requests. They help in managing resource versions and ensuring that updates are made to the correct version of a resource.
  SAP API Management: If you are using SAP APIs, familiarize yourself with the API management tools and best practices for handling ETags and entity updates.
  Concurrency Control: Understanding how SAP handles concurrency and versioning can help you design your application to avoid such errors.
  
  By following these steps and understanding the underlying concepts, you should be able to resolve the error and successfully update the entities in your SAP system.