How To Fix AU031 - Enter an asset subnumber when using external number assignment

SAP Error Message - Details

• Message type: E = Error

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

• Message number: 031

• Message text: Enter an asset subnumber when using external number assignment

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message AU031 - Enter an asset subnumber when using external number assignment ?

  The SAP error message AU031, which states "Enter an asset subnumber when using external number assignment," typically occurs in the Asset Accounting (FI-AA) module when you are trying to create or modify an asset using external number assignment without providing a required asset subnumber.
  Cause:
  The error arises because when using external number assignment for assets, SAP requires an asset subnumber to be specified. This is necessary for the system to uniquely identify the asset, especially when multiple assets are created under the same main asset number.
  Solution:
  To resolve this error, you need to provide an asset subnumber when creating or modifying the asset. Here are the steps to do this:
  
  
  Access the Asset Master Record: Go to the transaction code for creating or changing an asset (e.g., AS01 for creating an asset or AS02 for changing an asset).
  
  
  Select External Number Assignment: Ensure that you are using the external number assignment option.
  
  
  Enter Asset Subnumber: In the relevant field, enter a unique asset subnumber. This subnumber typically follows the main asset number and helps in distinguishing between different assets that share the same main number.
  
  
  Complete the Transaction: After entering the required information, proceed to save the asset record.
  
  
  Related Information:
  
  
  Asset Numbering: In SAP, assets can be assigned either internally or externally. Internal assignment allows the system to generate the asset number automatically, while external assignment requires the user to provide the asset number.
  
  
  Asset Subnumber: The asset subnumber is a way to categorize or differentiate assets that are closely related or belong to the same main asset. It is particularly useful in scenarios where multiple components or parts are associated with a single asset.
  
  
  Configuration Settings: If you frequently encounter this error, it may be worth reviewing the configuration settings in the Asset Accounting module to ensure that the number assignment settings align with your organization's asset management practices.
  
  
  Documentation and Help: For further assistance, you can refer to SAP's official documentation or consult with your SAP support team for specific configurations related to your system.
  
  
  By following these steps and understanding the context of the error, you should be able to resolve the AU031 error effectively.