How To Fix NAA021 - Settlement document type &1 is not defined (internal error)

NAA021 - Overview

• Message type: E = Error

• Message class: NAA - Subsequent settlement (Purchasing)

• Message number: 021

• Message text: Settlement document type &1 is not defined (internal error)

What causes this issue?

Settlement document category &V1& cannot be processed.

System Response

The function is not performed.

How to fix this error?

Contact your system administrator. This is due to an internal program
error (function module &V2&).

Procedure for System Administrators

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

Error message extract from SAP system. Copyright SAP SE.

NAA021 - Details

• The SAP error message NAA021, which states "Settlement document type &1 is not defined (internal error)," typically occurs in the context of settlement processes in SAP, particularly when dealing with Asset Accounting or similar modules. This error indicates that the system is trying to process a settlement document type that has not been defined in the system configuration.
  
  Cause:
  
  Missing Configuration: The settlement document type referenced in the error message (&1) has not been defined in the system. This could be due to a configuration oversight during the setup of the Asset Accounting module or related processes.
  Incorrect Document Type: The document type being referenced may be incorrect or not applicable for the current transaction.
  Transport Issues: If the configuration was recently transported from another system, it may not have been properly imported or activated.
  
  
  Solution:
  
  
  Check Configuration:
  
  Go to the configuration settings for Asset Accounting (Transaction code: SPRO).
  Navigate to Financial Accounting (New) > Asset Accounting >