BPM contract approval based owner check box under contract Parties

Summary:

We build approval based on the contract parties roles if it is "Buyer" it will go for the first managers, in case we have 3 "Buyers" it retrieves 3 buyer's managers, we need to add the condition "Owner" Check box so if its contract party role "Buyer" and we checked "Owner" to go for this buyer manager only not all buyer's managers, so what the right condition that we need to add

Approval only for the below buyer

Current setup

If

InternalContacts.croCode is "BUYER"

Then

List Builder: Supervisory

Response Type: Required

Number of levels: 1

Starting Participant: HierarchyBuilder.getManager_1("supervisory",InternalContacts.username,-1,"","")