Catch Weight in Purchase Requisition

Hi All

Can we use Catch Weight Unit in Purchase Requisition. I am having issue, I have created and approved Purchase requisition now when I am converting Purchase requisition to purchase order, having infolog which says "Quantity less then minimum catch weight..........". and PO can not be created. I know this is due to absence of catch weight. but there is no Catch weight Qty and unit field field on purchase requisition.

Regads,

Akhwand Usman