Blanket purchase agreement- charge account blank?

Hi All-

R12 Purchasing question: We have an approved blanket purchase order with about thirty lines and we are unable to see the charge account on any of the lines- the fields are all null.

Navigator - >Find Purchase orders (enter purchase order number and it find)

In Purchase Order Headers form, click 'Open' button to open the blanket purchase agreement

In Purchase Order Summary form, under the 'Lines' tab, scroll to the right and see 'Charge Account' field is null for all lines

When I searched for requisitions using that PO number, I get 24 requisitions, all having the same charge account. Can anyone shed some light on why we can't see the charge account on the purchase order lines?