POST to /PODetails REST API not setting UnitCost

I’m using the /PODetails REST service to insert PO Lines. The line items are being inserted but the UnitCost always returns with a 0 values. I can update the ContractUnitCost.

{“UnitCost”:“24.0”,“Company”:“ROCELEC”,“XOrderQty”:“7000.0”,“CalcVendQty”:“7000.0”,“OrderQty”:“7000.0”,“PartNum”:“2SK1909-DL-E”,“PONUM”:234362,“CalcOurQty”:“7000.0”,“CalcVendQty”:“7000.0”}

Thanks in advance

Solved it. Needed to set ScrUnitCost.