After submission, an invoice only shows for the first listed approver.
Once the first approver approves the invoice, it will show for approval by the next listed approver.

This information can be found in:

  1. In Accounts Payable, select Configuration, Approval Rules.
  2. Open the approval rule, and select the line which covers the invoice amount.
  3. The invoice will show to each approver, in the order listed here.