AP Approval Process in iExpenses

Hi,
Currently working on iExpenses Module. I am working on iExpense setups on couple of instances. One on Vision Instance and other on the Organization's instance.

1) When I tried out setups in the Vision instance, after Manager Approval Process the status of the report ran into Pending AP Approval process.

2) For the same expense category and amount when I tried this out in the Organization's instance, the report status after Managerial Approval Process was changed to "Ready for Payment" status.  It did not go through the AP Approval Process.

Hence would like to know which setup brings AP Approval Process into picture