Item's promotion changed after exiting from return mode

Hi All,

We have Xstore version 15.0.0.549

We are dealing with this issue related to promotion:

- Sale transaction with item A with promotion "Buy 1 Get 2nd HALF" , quantity 2, total $67.35

- Customer wants to return 1 item from the 2 above , price will be  -$33.68

and he will buy other item B which should have promotion "BUY 3 ITEMS FOR $15", quantity 3 , no promotion is shown, we have regular price = total $28.50

Note the fact the item B reflects no promotion, we have regular price on it.

If we will enter one more time the item B, quantity 1, this one will have regular price $9.50 , but the previous line transaction with item B (quantity 3) will show the promotion "BUY 3 ITEMS FOR $15" and will do correction for total price $15