Requester Change Order Using AME not routing to direct approver

We are planning to implement Requestor Change Order process for requisitions. We are on 12.1.3 and using AME for requisition approval and we have that set up to route to direct approver with the appropriate dollar authority. Example is we have Betty who approves for up to '500k' and John whose approval is 'unlimited'. When a newly created requisition is submitted for 700k it routes directly to John and bypasses Betty (which is what we want). But, for Requestor Change Order using AME and the increased dollar amount is raised to over 500k, the approval goes to Betty first (we