SAP Message V1051 - Sales office &1 is not defined for sales area &2 &3 &4

Diagnosis
Sales office &V1& is not allowed insales area &V2& &V3& &V4&.
INCLUDE 'NA_NO_PROCESSING_2' OBJECT DOKU ID TX
INCLUDE 'NA_CHECK_ENTRY' OBJECT DOKU ID TX LANGUAGE E
You can display the entries which are allowed in combination with thissales area by placing the cursor on the sales office field andselecting F4 (Possible entries)
You can create new sales offices or change the allocation of salesareas in Customizing for Sales if you have theauthorization to do so.