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
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and maintain the Tolerance key PS for upper and lower % limits, system first go through Val. check and then % tolerance limit check,
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then you will get the message M8083