SAP Message 6D128 - Error during number assignment

Diagnosis
The number of a real estate object was determined by a user exit(Business Transaction Event). During this event, an error occurred.
Possible causes:

  • The determined number "&V1&" is not within the number range interval "

  • V2" - "v3".
    • The determined number "&V1&" already exists.
    • Procedure
      Notify your system administrator.