How To Fix AP099 - Sequence number &1 assigned more than once

SAP Error Message - Details

• Message type: E = Error

• Message class: AP - Investment program messages

• Message number: 099

• Message text: Sequence number &1 assigned more than once

What causes this issue?

The column numbers specify the sequence of the output of value field
columns within the list. However, you have entered such a number
twice or several times, so that the output sequence is no longer
clear.

System Response

The list cannot be created.

How to fix this error?

Enter each column number only once.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message AP099 - Sequence number &1 assigned more than once ?

  The SAP error message AP099, which states "Sequence number &1 assigned more than once," typically occurs in the context of asset accounting. This error indicates that a sequence number (which is often used for asset transactions) has been assigned to more than one asset or transaction, leading to a conflict.
  Cause:
  
  Duplicate Entries: The most common cause of this error is that the same sequence number has been inadvertently assigned to multiple asset transactions or assets.
  Data Migration Issues: If data has been migrated from another system or if there have been manual entries that were not properly validated, it can lead to duplicate sequence numbers.
  Configuration Issues: Incorrect configuration in the asset accounting settings can also lead to this error, especially if the number ranges are not set up correctly.
  
  Solution:
  
  Identify Duplicates: Use transaction codes like SE16 or SE11 to check the relevant tables (e.g., ANLA for asset master data) for duplicate sequence numbers. You can run a query to find all instances of the sequence number in question.
  Correct the Data: Once duplicates are identified, you will need to correct the data. This may involve:
  
  Deleting or adjusting the duplicate entries.
  Ensuring that each asset or transaction has a unique sequence number.
  
  
  Review Configuration: Check the configuration settings for number ranges in the asset accounting module. Ensure that the number ranges are correctly defined and that there are no overlaps.
  Consult Documentation: Review SAP documentation or notes related to asset accounting and sequence number management for any specific guidelines or updates.
  Testing: After making corrections, perform tests to ensure that the error does not recur. This may involve creating new asset transactions to verify that the sequence numbers are being assigned correctly.
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as:
  
  AS01: Create Asset
  AS02: Change Asset
  AS03: Display Asset
  AN08: Change Number Ranges
  
  
  SAP Notes: Check SAP Notes for any known issues or patches related to this error message.
  User Exits and BAdIs: If you have custom developments, review any user exits or BAdIs that might be affecting the assignment of sequence numbers.
  
  If the issue persists after following these steps, it may be beneficial to consult with your SAP support team or reach out to SAP support for further assistance.