SAP Message VB606 - Number range & is not defined for internal number assignment

Diagnosis
Number range &V1& has not been assigned for external number assignment.

System Response
The system cannot execute the internal number assignment with thisnumber range.

Procedure
Please specify a number range in the appropriate document type forwhichthe internal number assignement has been designed.
INCLUDE 'NA_CUST_MAINTAIN_3' OBJECT DOKU ID TX LANGUAGE E