How To Fix FK421 - ID already exists; specify another ID

FK421 - Overview

• Message type: E = Error

• Message class: FK - Factory calendar

• Message number: 421

• Message text: ID already exists; specify another ID

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

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.

Unfortunately, there isn't any extra information in this error notice.

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Smart SAP Assistant

• What is the cause and solution for SAP error message FK421 - ID already exists; specify another ID ?

  The SAP error message FK421 ("ID already exists; specify another ID") typically occurs in the context of financial document processing, particularly when dealing with vendor invoices, customer invoices, or other financial transactions. This error indicates that the ID you are trying to use (such as a document number, reference number, or other identifier) is already in use in the system.
  
  Cause:
  
  
  Duplicate ID: The most common cause is that the ID you are trying to enter already exists in the database. This could be due to:
  
  A previous entry with the same ID.
  A system error that caused the ID to be saved incorrectly.
  Manual entry errors where the same ID is reused.
  
  
  
  
  Configuration Issues: Sometimes, the configuration settings for document numbering or ID assignment may not be set up correctly, leading to conflicts.
  
  
  Data Migration Issues: If data has been migrated from another system, there may be conflicts with existing IDs.
  
  
  
  Solution:
  
  
  Use a Different ID: The simplest