How To Fix WS_MASS021 - Document category & is not allowed (only Settl. Mgmt. documents possible)

WS_MASS021 - Overview

• Message type: E = Error

• Message class: WS_MASS - Settlement Management: Messages for Mass Processing

• Message number: 021

• Message text: Document category & is not allowed (only Settl. Mgmt. documents possible)

Self-Explanatory Message

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• What is the cause and solution for SAP error message WS_MASS021 - Document category & is not allowed (only Settl. Mgmt. documents possible) ?

  The SAP error message:
  WS_MASS021 Document category & is not allowed (only Settl. Mgmt. documents possible)
  
  
  Cause:
  This error occurs when you try to post or process a document in a settlement management context (such as in Contract Accounts Receivable and Payable - FI-CA) with a document category that is not allowed. The system expects only settlement management document categories, but the document category provided is either missing or incorrect.
  In other words, the document category you are trying to use is not valid for the settlement management process. Settlement management documents typically have specific document categories assigned, and if you use a category outside this set, the system throws this error.
  
  Explanation:
  
  Document Category: This is a classification of accounting documents in SAP, such as 'SA' for accounting documents, 'DR' for down payment requests, etc.
  In Settlement Management (FI-CA), only certain document categories are allowed because the process is specialized.
  If the document category is blank or