Change Log of unit price changes of Purchase orders

We are on MAPICS XA R6. We have issues regarding Unit prices are being 
changes of Purchase orders already raised and send to vendors. In Mapics 
we have two ways to look the changes on PO

a) Through Purchase Order Activity : Using this we can see the quantity 
changes and date changes applied on Purchase order since it raised but no 
unit price changes is being tracked. It is being logged for the changes 
made through green screen as well as Mapics browser.

b) PO changes from Mapics browser : It keeps log for every single change 
on PO provided changes has been made through Browser only.

So If we change unit price from green screen we do not have any Mapics Log 
for the same. Can any body in the list has any clue if MAPICS can do this 
? Also if we put a trigger on purchase order file it would definitely 
serve the purpose but un necessarily slow the system. Any other ideas on 
this ?


Thanks and Regards,
Anshul C Jain
01843 255 548 (O)