How to apply discount on primary uom while billing is in secondary uom in sales order line.

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Hi Experts

I am facing problem in sales order line while applying discount.

I have an item which is dual control.

Primary UOM is MTN

Secondary UOM is MTR

Now when we create sales order line for quantity of 8 tons and system shows 2948 MTR in secondary UOM which is ok

And we have given price of Rs.190 per mtr in price list already.

Now as per management order we have to give discount of Rs 500 per ton to customer. But item to be sale in MTR.