Separate description for each split transaction category

When I enter an expense I can add a description. When I press the plus I can add another expense. The description which relates to the first expense is then assigned to both expenses. The description is with the payment. 

Eg: I go to the gift shop and buy a card for my mother and chocolate for my sister and pay with cash. One payment is two transactions. When I review the transactions the description card for my mother is also on the chocolate for my sister.

It would be really lovely if the comments got attached to a transaction and not to a purchase. When I itemise an invoice and allocate it to different categories it would make much more sense to me to be able to write what each is for.