Diagnosis
You want to use a phrase library for which at least one of the followingnumber ranges was not specified in Customizing:
Missing Number Range,,Consequence
Internal number range ,,The system cannot assign a key.
External number range ,,The system cannot check the key entered.

Procedure
INCLUDE EHS_NA_ADMIN OBJECT DOKU ID TX

Procedure for System Administration
INCLUDE EHS_NA_CHECK_CUSTOMIZING OBJECT DOKU ID TX