How To Fix AAPO158 - Reversal is not possible; duplicate internal document number

SAP Error Message - Details

• Message type: E = Error

• Message class: AAPO - Asset Accounting - Posting

• Message number: 158

• Message text: Reversal is not possible; duplicate internal document number

What causes this issue?

Due to a system error, the internal 'asset document number' was
assigned more than once. Therefore the FI document can no longer be
clearly identified.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Carry out the reversal manually, and then repost the document that was
reversed incorrectly.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message AAPO158 - Reversal is not possible; duplicate internal document number ?

  The SAP error message AAPO158, which states "Reversal is not possible; duplicate internal document number," typically occurs when you attempt to reverse a document (such as an asset transaction) that has already been reversed or when there is a conflict with the internal document number assigned to the transaction.
  Cause:
  
  Duplicate Document Number: The internal document number for the transaction you are trying to reverse already exists in the system. This can happen if the reversal has already been processed or if there is a duplicate entry in the system.
  Transaction Already Reversed: The document you are trying to reverse may have already been reversed in a previous transaction.
  System Configuration: There may be issues with the configuration of document number ranges or settings in the asset accounting module.
  
  Solution:
  
  Check Existing Transactions: Verify if the document you are trying to reverse has already been reversed. You can do this by checking the asset history or transaction logs.
  Use the Correct Document Number: Ensure that you are using the correct internal document number for the reversal. If you are unsure, you can look up the original document number in the asset accounting module.
  Consult with Your SAP Administrator: If you suspect that there is a configuration issue or if you cannot find the document, consult with your SAP administrator or support team. They can help check the document number ranges and ensure that there are no conflicts.
  Manual Correction: If necessary, you may need to manually correct the entries or adjust the document number ranges to resolve the issue.
  Transaction Codes: Use transaction codes like AS03 (Display Asset) to view the asset and its transactions, or AB08 (Reverse Document) to attempt the reversal again after confirming the above points.
  
  Related Information:
  
  SAP Notes: Check SAP Notes for any known issues or patches related to this error message. SAP frequently updates its knowledge base with solutions for common problems.
  Documentation: Review the SAP documentation for Asset Accounting to understand the processes and configurations related to document management.
  User Forums: Consider visiting SAP community forums or user groups where similar issues may have been discussed, and solutions shared.
  
  By following these steps, you should be able to identify the cause of the error and take appropriate action to resolve it.