Advanced Order Entry - Reserving Stock

On the 1/AOP screen (details), we can see that you can reserve stock by putting
a 5 on the line.  Right now it brings up Purchase Orders that are out in the 
system.
I see that when you do the F8 Update, it puts the records in INP71 file.
This file has a field called SUPT71, in which the valid values are:
1=Batch, 2=W/O, 3=P/O, 4=Req.

If we would put in a 5 and wanted to reserve against Work Orders instead of
Purchase Orders, what things need changed?  I looked in the company profile,
but didn't see anywhere where it would allow me to pick what type of orders
(Work Order or Purchase Order) that I would want to reserve against.

Any assistance would be greatly appreciated.

Thank you

Bob Chambers
Hekman Furniture