Bonus item modifier without item specification

Hello experts,

im looking for a modifier, that creates an new order line for a bonus item.

This order line should be created for every order over 500 $. I use the order volume qualifier for this issue.

My Problem ist, that I have zu define a product attribut anf if i choose all items here the pricing engine creates the bonus item for every line and I need only one bonus item per order.

Thanks in advance!

Kind regards

CfE