BPM ReqApproval how to use nested if -It doesn't work as I expect

An approval rule must be generated where if an RQ has an AAA and BBB accounting account, it must always be sent to one approval group, and if it has a BBB account, it must also be sent for approval to another approval group.

I configured the rule using the "if" statement, but I see that it is always sent to both approvers even when the RQ only has an AAA accounting account.