access sequence and condition records for the fields not there in the purch

HI,

I want to an access sequence for condition type ZGID in purchase order (vendor/ Plant/ Purchase organization/ Basic Material / Country of origin) . But the problem is that (Vendor / plant / purchase organization) fields are available in purchase order screen but (Basic material / country of origin) is in Material master hence the values are not flowing.

Is there any way I can create access sequence and condition records for the fields not there in the purchase order screen

Regards

Fazal