How To Fix K-287 - External number &1 is used in more than one transaction

K-287 - Overview

• Message type: E = Error

• Message class: K- -

• Message number: 287

• Message text: External number &1 is used in more than one transaction

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 K-287 - External number &1 is used in more than one transaction ?

  The SAP error message K-287 "External number &1 is used in more than one transaction" typically occurs in the context of financial transactions, particularly when dealing with external number ranges for documents. This error indicates that the external number you are trying to use has already been assigned to another transaction, which violates the uniqueness requirement for external document numbers.
  
  Cause:
  
  
  Duplicate External Number: The external number you are trying to enter has already been used in another transaction. This can happen if:
  
  The number range is not properly configured.
  There is a manual entry error where the same number is reused.
  Multiple users are trying to post transactions simultaneously using the same external number.
  
  
  
  
  Configuration Issues: The number range settings in the SAP system may not be correctly defined, allowing for overlaps or duplicates.
  
  
  
  Solution:
  
  
  Check Existing Transactions: Verify if the external number you are trying to use is already assigned to another transaction. You can do