How To Fix BK192 - The external number is not unique, enter an internal number

SAP Error Message - Details

• Message type: E = Error

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

• Message number: 192

• Message text: The external number is not unique, enter an internal number

What causes this issue?

You entered an external number for document selection. This number is
not a unique entry.

How to fix this error?

Enter the Controlling document number and the controlling area.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message BK192 - The external number is not unique, enter an internal number ?

  The SAP error message BK192, which states "The external number is not unique, enter an internal number," typically occurs in the context of financial transactions, particularly when dealing with document numbers in the SAP system. This error indicates that the system has detected a duplicate external document number that is not unique within the specified range.
  Cause:
  
  Duplicate External Number: The external document number you are trying to enter already exists in the system. SAP requires that external document numbers be unique to avoid confusion and ensure data integrity.
  Configuration Settings: The system may be configured to require unique external numbers for certain document types, and if the number you are trying to use has already been assigned, the system will reject it.
  Data Entry Error: There may have been a mistake in data entry, leading to the use of a number that has already been recorded.
  
  Solution:
  
  Use an Internal Number: If the system allows, switch to using an internal document number instead of an external one. This can often bypass the uniqueness requirement.
  Check Existing Document Numbers: Before entering a new external number, check the existing document numbers in the relevant tables or transaction codes (like FB03 for viewing financial documents) to ensure that the number you want to use is not already in use.
  Change the External Number: If you need to use an external number, choose a different number that is guaranteed to be unique.
  Review Configuration: If you have the necessary permissions, review the configuration settings for document number ranges in the relevant financial module (like FI) to understand the rules governing external numbers.
  Consult with Your SAP Administrator: If you are unsure about the correct approach or if the issue persists, consult with your SAP administrator or support team for further assistance.
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with transaction codes like FB01 (Post Document), FB03 (Display Document), and FBL1N (Vendor Line Item Display) to check existing documents and their numbers.
  Document Number Ranges: Understand how document number ranges are set up in your SAP system, as this can affect how external numbers are managed.
  SAP Notes: Check SAP Notes for any known issues or updates related to this error message, as there may be patches or updates that address specific scenarios.
  
  By following these steps, you should be able to resolve the BK192 error and continue with your financial transactions in SAP.