Discount code looking at total order

I setup a 3% discount for orders between $200-$300.

I setup a filter to exclude 1 category.

The order contains $70 of product eligible for discount and $150 of product not eligible.

The discount code sees the $220 order and applies the 3% discount to the $70 order.

It seems that the discount should not be applied to the $70 order since it is not in the $200-$300 range.

I would think the discount code should not be looking at the total order.  Instead it should subtract the filtered categories/products from the total order before deciding it falls in the $200-$300 range.

Any help would be appreciated.

Thanks,
Jack