Pricing: Quantity Break Modifier for Models

 Hi,

When we setup Price Break Header with Group of lines option, It works fine with all standard items.

But when we configure a Model, it looks like it is summing quantities from all sublines
which is making the result not correct.

Exmple
------
Line 1: Model 1 => QTY => 10
Line 2: Model 2 => QTY => 5

Lets say I have a Price Break header, with group of lines set up as follows [Also attached]

QTY Break
1 => 10, 20%
11 => 20, 30%
21 => 9999999, 40%

I would expect this to order to get a discount of 30%. But it will give a discount as 40% as the quanties from all the
sublines of a model is been summed up.