Adjust P/O Line item Unit Costs

	This program allows adjusting the unit cost of any P/O in the current 
	P/O master file, regardless of status.

	Select the line to be changed and a window will appear for editing the
	line item unit cost. For inventory PNs, a checkbox to update the unit
	cost also for this item in the master inventory is provided.

	The default for the Update Inventory checkbox is ON if the P/O line item
	is fully received or the P/O is flagged as Complete. 

	If the line item is still open, the default is to NOT update inventory,
	the reasoning being that Inventory will be updated with the new corrected
	unit cost at the time the item is received.

	However the user may choose whichever option they wish.

	A report of each line item changed is printed with old and new costs
	and the net value change for both the P/O and in Inventory.