Oracle approval management - payables invoice approval help

 Hi

Need help:

1) The AME rules are based on Cost centre conditions but for specific expense types approval should go to approvers based on GL account. What are the steps to implement exception condition & exception rule?

2) For cost centres there are multiple approvers and one approver's approval is enough. "First responder wins" function not working (parallization error) for payable invoice approval transaction type. Any work around?

Thanks