How to prevent Sales order with zero unit price/Cost

Hi,

Is there a way by which we can prevent processing Sales orders where items having zero unit price/ Cost? JDE provides facility to create sales order with zero cost, but client want to restrict such sales order if those entered with zero unit cost.

Please let me know if there is any way to prevent order entry or order processing if zero unit cost for item is there on order.

Thanks

Amrut