How To Fix 5T121 - Number range not for internal number assignment

5T121 - Overview

• Message type: E = Error

• Message class: 5T - HR-FB messages which access TemSe

• Message number: 121

• Message text: Number range not for internal number assignment

What causes this issue?

An error occurred when function module NUMBER_GET_NEXT was accessed.
EXCEPTION FB_NR_NOT_INTERN was triggered.
The cause is unknown.

How to fix this error?

Look for a note on this error message in OSS. If you cannot find one,
take note of the above information and notify the SAP telephone service
of the problem.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message 5T121 - Number range not for internal number assignment ?

  The SAP error message 5T121 indicates that a number range is not configured for internal number assignment. This typically occurs when you are trying to create a document or record that requires a number from a number range that is set up for external number assignment instead of internal.
  
  Cause:
  
  Number Range Configuration: The number range you are trying to use is configured for external number assignment. This means that the system expects the user to provide the number manually rather than generating it automatically.
  Incorrect Number Range Assignment: The document type or object you are trying to create may be linked to a number range that is not set up for internal assignment.
  Missing Configuration: The number range may not be properly defined in the system for the specific document type or object.
  
  
  Solution:
  
  
  Check Number Range Configuration:
  
  Go to transaction code SNRO (Number Range Objects).
  Find the relevant number range object associated with the document type