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

AU031 - Overview

• 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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To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

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AU031 - Details

• 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: