How To Fix BUP_CENT021 - External BP number &1 is already assigned

BUP_CENT021 - Overview

• Message type: E = Error

• Message class: BUP_CENT - BP: Messages for Segment General Data

• Message number: 021

• Message text: External BP number &1 is already assigned

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.

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Smart SAP Assistant

• What is the cause and solution for SAP error message BUP_CENT021 - External BP number &1 is already assigned ?

  The SAP error message BUP_CENT021 indicates that the external Business Partner (BP) number you are trying to assign is already in use. This typically occurs when you attempt to create or assign a Business Partner with an external number that has already been assigned to another Business Partner in the system.
  
  Cause:
  
  Duplicate External Number: The external Business Partner number you are trying to use is already assigned to another Business Partner.
  Data Migration Issues: If you are migrating data from another system, there may be conflicts with existing external numbers.
  Incorrect Input: The external number may have been entered incorrectly, leading to confusion with existing records.
  
  
  Solution:
  
  
  Check Existing Business Partners: 
  
  Use transaction code BP to search for existing Business Partners and verify if the external number is already assigned.
  You can search by the external number to see if it is linked to another Business Partner.
  
  
  
  Use a Different External Number: 
  
  If the external number is