We are using KG as the primary UOM and frozen cost is based on kg. While selling, we sell it in cart

We are using KG as the primary UOM and frozen cost is based on kg. While selling, we sell it in carton, one carton is 6.8 KG. 

When we create a sales order, unit price is calculated correctly in CARTON as our pricing UOM is in carton, but the unit cost is shown in KG. So the profit margin is too high.  

Now I under stand that unit cost is not converted pricing UOM.  Because of the this, the profit margin in sale order details (F4211) become irrelevant and creates problem during sales updates too.

COGS & Inventory is valued at primary UOM while revenue and AR is at pricing UOM.