Sales office Mandatory at Initial Screen

Question

Dear experts,
When we create a sales order in VA01 we need to maintain the sales office as Mandatory for certain sales area in the initial screen.
Incompletion log doesnu2019t help because it will be controlled only at Overview or Header or Item Screen level.
User exit is helpless at initial Screen.
Transaction Variant is possible but it will become mandatory for all sales area. I want to make this as mandatory only for certain sales area.
Pl suggest if some one come across the similar issue
Bala

Answer 1

Hi Raja,
Sorry for delay.
We have already maintained the OVAZ setting for all document types with respect to sales area. I have created a new Transaction Variant with input Parameters of ZXA1 document type, sales Area and sales office. I have also assigned the transaction Variant to ZXA1 document type in VOV8.
When I try to create a sales order with ZXA1 Document type it is not asking the sales office as Mandatory. But, after entering to overview screen I Pressed Back Button without entering any data. Now the variant is triggered and asking the sales office as Mandatory. 
I donu2019t know why the Transaction Variant is working only if I come back from the overview screen to initial Screen in VA01.
If anyone come across Pl through some light
Bala