Approver not appearing on the Create Expense Report: Review screen and the expense being auto approv

Hi

I am hoping that someone out there might be able to point me in the right direction to what setup we have missed. A previous team (who have now left) setup expenses for EBS and all is working well but we have now been asked to roll this out to another business group. All the setup is looking good except the old group goes to the Approver for approval but the new group gets auto-approved (but it needs to be approved). I have noticed on the Create Expense Report: Review screen that the approver is shown for the old group