outlay v return

The ratio of amount spent to prospective profit in Dutching can be expressed through a formula (all Dutching formulas are available here):

LIABILITY = back_book*(PROFIT/(100 - back_book))

Therefore, in your case you need to add the following condition:

and Selection's Trigger Expression match_b_book*(PROFIT/(100 - match_b_book)) is equal or less than PROFIT

where PROFIT should be replaced with your constant for target profit.