SAP Message VW638 - Text maint.not possible; Customizing shipment type &1 does not have &2

Diagnosis
You have attempted to switch to the tabstrip control for textmaintenance. A text determination procedure is required for textmaintenance, but the shipment type of the current shipment does notcontain any.

System Response
Counter_0

Procedure
In Customizing (Define and assign text determinationprocedure), assign a text determination procedure to the shipmenttype.