I want to maintain that freight (value) costs will be always mandatory for vendors with custom schema. I tried it to set in SPRO>MM>Purchasing>Conditions>Define price determination process> Define calculation schema and under control data for schema for example: Z001 I set that FRB1 Freight (Value) with field manual not checked, field required. You can see result enclosed. There is value zero, and cannot be replaced. This value can be replaced in conditions at item level. But I want to control this condition at document level. I can not find any solutions.