Number range & does not exist

What causes this issue?

The number range to be used for the
<GL:equipment_category>equipment category</> specified does not exist
in the system.

System Response

INCLUDE 'KEINE-VERARBEITUNG' OBJECT DOKU ID TX LANGUAGE E

How to fix this error?

You must allocate a valid number range to the equipment category by
means of the customizing function:
IF &DEVICE& = 'SCREEN'
<DS:TRAN.OIEN>Proceed</>
ENDIF
INCLUDE 'DARF-NICHT' OBJECT DOKU ID TX LANGUAGE E

Error message extract from SAP system. Copyright SAP SE.