How To Fix BK402 - Document number & is already in use.

BK402 - Overview

• Message type: E = Error

• Message class: BK - Create, Display, Reverse Controlling Document

• Message number: 402

• Message text: Document number & is already in use.

What causes this issue?

Document number & is locked.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message BK402 - Document number & is already in use. ?

  The SAP error message BK402 ("Document number & is already in use") typically occurs in the context of financial document processing, particularly when trying to post or modify a document that is already being processed or has been posted in the system. Here’s a breakdown of the cause, potential solutions, and related information:
  
  Cause:
  
  Document Already Posted: The document number you are trying to use has already been posted in the system, and SAP does not allow the same document number to be reused for a new transaction.
  Document in Use: The document may be locked by another user or process, preventing you from making changes or posting a new document with the same number.
  Batch Input Sessions: If you are using batch input sessions, the document might be in a session that is still being processed.
  Error in Document Flow: There might be an inconsistency in the document flow, where the system believes the