I-Expenses to AME to approve by Expense Type

Hello,

We have a business requirement that all expense with expense type "Training" should be sent to members of the "Learning Unit" for approval after management approval.  I have created an approval group with the members.  But the AME seems to ignore the condition and updates status to Pending Payables Approval with the the post approval groups response.  Anyone guidance would be appreciated with how to configure AME to be expense type specific, as other units may have similar requirements.