How To Fix BK045 - Number already assigned; select another number.

SAP Error Message - Details

• Message type: E = Error

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

• Message number: 045

• Message text: Number already assigned; select another number.

What causes this issue?

You selected an external number for which a cost accounting document
already exists in the SAP System.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Display the number range information and assign a new external number.
Let the system automatically assign a number for you (<ZH>Environment
-> CO document NoRanges</>).

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message BK045 - Number already assigned; select another number. ?

  The SAP error message BK045 ("Number already assigned; select another number") typically occurs in the context of financial transactions, particularly when dealing with document numbers in the SAP system. This error indicates that the number you are trying to use for a document (such as an invoice, journal entry, or other financial document) is already in use or has been assigned to another document.
  Causes:
  
  Duplicate Document Number: The document number you are trying to enter has already been assigned to another transaction in the system.
  Number Range Configuration: The number range for the document type you are using may be configured incorrectly, leading to conflicts.
  Manual Entry Error: Users may inadvertently try to enter a document number that has already been used.
  System Settings: The system may be set to use a specific number range that does not allow for the reuse of numbers.
  
  Solutions:
  
  Use a Different Number: The simplest solution is to select or enter a different document number that is not already in use.
  Check Existing Documents: Review the existing documents in the system to see if the number you are trying to use is already assigned. You can do this by searching for the document in the relevant transaction code (e.g., FB03 for displaying financial documents).
  Adjust Number Range Settings: If you have the necessary authorizations, check the number range settings for the document type in transaction code SNRO (Number Range Objects). Ensure that the number range is correctly defined and that there are available numbers.
  Consult with SAP Basis or Functional Team: If you are unable to resolve the issue, it may be necessary to consult with your SAP Basis or functional team to investigate the configuration and settings related to document numbering.
  Check for Customizations: If your organization has custom developments or enhancements, ensure that they are not interfering with the standard number assignment process.
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as FB01 (Post Document), FB03 (Display Document), and SNRO (Number Range Objects).
  Documentation: Review SAP documentation or help files related to document management and number ranges for more detailed guidance.
  User Authorizations: Ensure that you have the necessary authorizations to create or modify documents in the system, as restrictions may lead to errors.
  
  By following these steps, you should be able to resolve the BK045 error and continue with your financial transactions in SAP.