Price Discount Flat Rate

Hi Friends

I have a requirement. and need a solution for the same - Please help me

We Sell Vehicle to Customer.

We need to give discount of Rs 5000 per Vehicle, to a maximum of 5 vehicle in a Quater. Maximum amount ( Rs25,000).

Now if I place a order of 7 Qty (2+5) the Sale Order is picking the discount amount of Rs 25,000 (10,000 & 15000) but this amount is equally splitted for 2 vehicle correctly and balance 5 vehicle the discount is splitted as 15000 / 5 . /hence the discount is 3000 per vehicle in second sales Order.

In the above case I need to give discount of flat 5000 to first 5 vechile place. and for the balance 2 Qty the discount should be 0.

How can I achieve it. (Discount should be fixed per Vehicle and should not be equally divided).

If I order the vehicle 1 per line item i have no issue as I mentioed Max Condition Base Value : 5 QTY in VK12 at Additional Data.

Can You please help me on this requirement.

Kind Regards

Ganesh