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You can do that in the script itself by adding a flag field which checks whether [PO Vendor Agreement Item Description] is the same as [PO Vendor Item Vendor Item Description] , if the condition is true then the flag is 1 and if false the flag is 0. You then sum ([PO Vendor Agreement Lawson UOM Cost] * Flag) or Count() the flags. Hope that helps.
This seems to work
Sum ({$<[Field A]-={"=[Field A]=[Field B]"}>} [Cost])