Promotions on Customizable Product

Hi,

I have created a Customizable product CP1 where it has ProdA, Prodb, ProdC.

I have created a Bundle promotion BP1 where it will discount just one Unit of Prod1

So scnario is something like this: -

Customer creates an order and select the CP1 and customizes to buy 3 units of ProdA, however since I have "Auto Explode on ProdA, it explodes into Different line items with one unit each

Now when i apply BP1 promotion, it discounts just one of the line item out of the 3 that got exploded

My question is, how do I know which line the discount was recieved. The only one way I could see is that at the order line item there is a column something like "Adjust Price..." which contains some value.... but I do not think it is a cleaner way to identify the line item on which the discount was applied because if one does "Price Override" than the value disappears