Purchase Price Hierarchy - Is there an automatic method?

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We have been investigating the price that pulls into a purchase order
for an item.  We have found that the price can be set to default to
Current Material (ITEMASB), Purchase Price (ITEMASC), Standard Unit Cost
(ITEMBL), or Unit Cost Default (ITEMASA) by setting the Purchase Price
Default code in the Purchasing Control File (PURCTL) from the Purchasing
menu.

All of these fields appear to be manually controlled.  Is there a method
to have MAPICS automatically update a field that can be used to set the
default price for an item as a purchase order is entered.  We would like
to use the price paid on the last previous order or invoice for the
item.

We are on release 6 and do not currently have Procurement Management.
We also use Standard costing.

Thanks,
David Kemp
Enterprise Electronics Corp.