Product Script: Multiple same product instance

Dear Experts,

I have a product similar to the below structure with 2 attributes.

Root Product

|_ Component Product (CP)(Max Cardinality:999)

     |_(Attr) Start Date

     |_(Attr) End Date

When the End Date / Start Date is entered, we need to compare the dates and the difference between them should be 2 days, else we need to nullify the End Date.

We implemented it using Attribute Change event. And this works fine if only one Component Product is selected.

If the customer selects 2 CP like the below structure, we have issues in the validation.

Root Product

|_ (1)CP

     |_ Start Date : Value X

     |_ End Date  : Value X+2