Diagnosis
You want to assign an external document number even though an indicatorfor external number assignment has not been set for the number rangeallocated to this document type.

Procedure
If external number assignment should be allowed for this document type,you must set an indicator for external number assignment for the numberrange allocated. Otherwise you can delete the number of the numberrange for external number assignment in the document type so that thefield no longer accepts input for external number assignment in thedocument.
INCLUDE 'NA_CUST_MAINTAIN_3' OBJECT DOKU ID TX LANGUAGE E
Set indicator: