When the parameter NWSPurchaseOrderItemAddingAllowed is set as True, extra material rows can be added to a purchase order item.
Select a purchase order item without available raw material rows. Click 
and new raw material row appears under the selected purchase order item.
When the parameter NWSPurchaseOrderItemAddingAllowed is set as False, adding of extra raw material rows is not allowed in Workshop Receiving. Only items not received yet can be received. Extra items are not allowed.
