How To Fix AU255 - You cannot enter subnumber &1 for legacy asset &2

AU255 - Overview

• Message type: E = Error

• Message class: AU - FI-AA utility program error messages

• Message number: 255

• Message text: You cannot enter subnumber &1 for legacy asset &2

What causes this issue?

The asset sub-number &V1& could not be created, since there is an error
in the asset main number belonging to it. The main number with
the error is asset number &V2&.

How to fix this error?

Correct the error in the asset main number. After the main number is
created, you can create the sub-number.

Error message extract from SAP system. Copyright SAP SE.

AU255 - Details

• The SAP error message AU255, which states "You cannot enter subnumber &1 for legacy asset &2," typically occurs in the context of asset accounting when there is an issue with the subnumber of a legacy asset during transactions such as asset transfers, adjustments, or postings.
  
  Cause:
  
  Invalid Subnumber: The subnumber you are trying to enter does not exist for the specified legacy asset. This can happen if the subnumber was not created or if it has been deleted.
  Legacy Data Issues: If the asset was migrated from a legacy system, there may be inconsistencies or missing data related to subnumbers.
  
  Configuration Issues: The configuration settings in the asset accounting module may not allow for the use of subnumbers for certain types of assets or transactions.
  Transaction Type Restrictions: Certain transaction types may not support subnumbers, leading to this error when attempting to use them.
  
  
  Solution:
  
  Verify Subnumber: Check if the subnumber you are trying to enter is