How To Fix MY420 - Error during document number assignment

SAP Error Message - Details

• Message type: E = Error

• Message class: MY - Messages for Balance Sheet Valuation(Low.Val.Det./LIFO/FIFO)

• Message number: 420

• Message text: Error during document number assignment

What causes this issue?

No document number could be assigned for the following criteria:
Number range object: ML document
Number range: &V1&
Fiscal Year: &V2&

System Response

Processing is terminated.

How to fix this error?

Use the program <LS>Number Range: Material Ledger Document</>
(transaction <DS><DS:TRAN.OMX4>OMX4</></> to check the number range
interval for number range object <(>&<)>1.

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

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message MY420 - Error during document number assignment ?

  The SAP error message MY420, which states "Error during document number assignment," typically occurs when there is an issue with the assignment of document numbers in the system. This can happen in various modules, such as Materials Management (MM) or Financial Accounting (FI), where document numbers are crucial for tracking transactions.
  Causes of MY420 Error
  
  
  Number Range Issues: The most common cause is that the number range for the document type being used is either exhausted or not properly configured. This can happen if the number range is set to a limited range and all numbers have been assigned.
  
  
  Document Type Configuration: The document type may not be correctly configured in the system. This includes settings related to number ranges, document types, or the assignment of number ranges to specific document types.
  
  
  Authorization Issues: Sometimes, the user may not have the necessary authorizations to create or assign document numbers.
  
  
  System Configuration Errors: There may be issues with the overall configuration of the SAP system, such as missing or incorrect settings in the customizing (SPRO) related to document number assignment.
  
  
  Database Issues: In rare cases, database inconsistencies or issues can lead to problems with document number assignment.
  
  
  Solutions to MY420 Error
  
  
  Check Number Ranges:
  
  Go to transaction code SNRO (Number Range Objects).
  Check the number range object related to the document type you are using (e.g., MATERIAL for MM documents).
  Ensure that the number range is not exhausted. If it is, you may need to extend the number range.
  
  
  
  Review Document Type Configuration:
  
  Use transaction code SPRO to navigate to the relevant configuration settings.
  Check the settings for the document type in question and ensure that it is correctly linked to the appropriate number range.
  
  
  
  User Authorizations:
  
  Verify that the user has the necessary authorizations to create documents of the specified type. This can be checked in transaction code SU53 after the error occurs.
  
  
  
  Consult with Basis Team:
  
  If you suspect a database issue or if the problem persists after checking the above, consult with your SAP Basis team to investigate any underlying system issues.
  
  
  
  Check for SAP Notes:
  
  Sometimes, specific issues may be documented in SAP Notes. Check the SAP Support Portal for any relevant notes that might address the MY420 error.
  
  
  
  Testing in a Development Environment:
  
  If possible, replicate the issue in a development or test environment to further diagnose the problem without affecting production data.
  
  
  
  Related Information
  
  
  Transaction Codes: 
  
  SNRO: Number Range Objects
  SPRO: SAP Reference IMG (Implementation Guide)
  SU53: Authorization Check
  
  
  
  Documentation: Review SAP documentation related to number range management and document types for more detailed guidance.
  
  
  SAP Community: Engage with the SAP Community forums for insights from other users who may have encountered similar issues.
  
  
  By following these steps, you should be able to identify and resolve the MY420 error in your SAP system.