Currently, if you have access to self-approve invoice requests then the approval rule defaults to that even when you choose to copy a previous invoice. This is a huge inconvenience when you have a large variety of vendors that go to different approvers.

Compounding the issue, anyone set as 'solution admin' is unable to disable self-approval settings unless they give themselves a different role. To retain your admin access and remove the ability to self-approve, you have to create fifteen different roles and also give yourself Invoice security access.

This is an enormous waste of time.

My proposal is to add an option to enable/disable self-approval organization-wide under the Business Rules section in Expense Management settings. If you want to get fancy, you could include the ability to exempt certain users if self-approval is disabled.