Purchase Order Unit in Purchase Order

Hi,

Price Unit in Purchase order taking if material and Vendor combination having the Info record, If Info record 120$ per 10 Price Unit.

Then system take Price Unit "10" in PO -This is correct.

While creation of PO without Info record system automatically taking price unit"1"  in PO creation even though Material Price maintained  120$ per 10 EA in accounting view.

Even we tried to create PO without Material also then also system taking Purchase order Price unit "1"  why and from where it is taking.

Thanks

sapman man