How To Fix F5271 - The reverse key & for the posting key & is invalid

SAP Error Message - Details

• Message type: E = Error

• Message class: F5 - Document Editing

• Message number: 271

• Message text: The reverse key & for the posting key & is invalid

What causes this issue?

The reverse posting key is not allowed for one of the following
reasons:
account type deviates from the account type of the posting key
the reverse posting key for special sales is there, the posting key,
however, is not (or vice versa)
the reverse posting key has the same debits/credits indicator has
posting keys

How to fix this error?

Specify another reverse posting key for the posting key.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message F5271 - The reverse key & for the posting key & is invalid ?

  The SAP error message F5271, which states "The reverse key & for the posting key & is invalid," typically occurs during the reversal of a financial document. This error indicates that the system is unable to find a valid reverse key for the specified posting key, which is necessary for processing the reversal.
  Causes:
  
  Invalid Posting Key: The posting key specified in the reversal process may not be configured correctly or may not exist in the system.
  Missing Reverse Key Configuration: The reverse key for the specified posting key may not be defined in the system. Each posting key should have a corresponding reverse key for reversal transactions.
  Document Type Issues: The document type associated with the transaction may not allow reversals or may not have the necessary configurations.
  Authorization Issues: The user may not have the necessary authorizations to perform the reversal for the specified posting key.
  
  Solutions:
  
  
  Check Posting Key Configuration:
  
  Go to the transaction code OB15 (for posting keys) and verify that the posting key in question has a valid reverse key assigned.
  Ensure that the reverse key is correctly configured in the system.
  
  
  
  Review Document Type Settings:
  
  Check the document type settings in transaction code OBY6 to ensure that the document type allows for reversals and that the necessary configurations are in place.
  
  
  
  Verify User Authorizations:
  
  Ensure that the user attempting the reversal has the necessary authorizations to perform the action. This can be checked with the help of your SAP security team.
  
  
  
  Consult SAP Notes:
  
  Check for any relevant SAP Notes that may address this specific error. Sometimes, there are known issues or patches that can resolve the problem.
  
  
  
  Testing in a Development Environment:
  
  If possible, replicate the issue in a development or test environment to further analyze the problem without affecting production data.
  
  
  
  Contact SAP Support:
  
  If the issue persists after checking the above points, consider reaching out to SAP support for further assistance.
  
  
  
  Related Information:
  
  Transaction Codes: 
  
  FB08: Reverse Document
  OB15: Maintain Posting Keys
  OBY6: Define Document Types
  
  
  Documentation: Review SAP documentation related to financial accounting and document reversal processes for additional insights.
  User Forums: Check SAP community forums or user groups for similar issues and solutions shared by other users.
  
  By following these steps, you should be able to identify the cause of the error and implement a solution to resolve it.