Workflow of Purchase Orders

[Richard Williams (FCF)]

We have workflow for Purchase Requisition approval, the business have =
asked me if it is possible to workflow the PO if, and only if the =
quantity, price or vendor gets changed during the PR - PO conversion.
 
Can this be done and if so is there any one that can give me a few =
pointers, how would I get the system to know that there has been a =
change from the original PR?
 
Thank you for your help.
 
Richard Williams
Fletcher Challenge Forests
SCG, Rotorua
07-349 5224
0274 865 160
=20