Need a single line item in case of partial substitution - RBA

Hi,

   My case is as below [on rule based substitution]:

Requirement for PRD1= 100 qty . And Product substitution for PRD1 is PRD2. Where PRD stands for product

But ATP for PRD1= 50 qty, but ATP for PRD2 = 150 qty.

In standard RBA, it trys to fullfill the requirement by PRD1 first and then by PRD2. So 50 qty is fullfilled by each  PRD1 & PRD2.  Means created two line items.

But i want to fullfill my requirement  by PRD2 it self so to avoid more lines. How to control it and is there any setting  to do this case ?

Basically substitution should happened for case where there is full stock.

Similarly case is possible for the location substitution as well.

Thanks

Ajit