Hi,
If the price in an order item is marked as an estimated price, for this item, the system calculates the difference between the invoice value and the product of quantity invoiced * order price and compares the variance with the upper and lower tolerance limits defined
Please confirm your PO should have following check on condition control tab
and maintain the Tolerance key PS for upper and lower % limits, system first go through Val. check and then % tolerance limit check,
then you will get the message M8083