PeopleSoft AWE Workflow Question

Hello All,

Thanks in advance. I have following questions with respect to workflow for AP Vouchers.

1. We plan to use Origin to default Workflow and assign the origins to user who do online vouchers to enforce the same. There is a need for my client where certain times want to by-pass workflow. This is applicable to handful of users. So, I thought one could do this by setting Approval to "Preapproved" on Voucher Attributes Page under Voucher Entry Panel. We will control through PS Security by restricting access to all users except those needed. This would work for us however, the system is not letting me override here and throws a message that it defaulted