Purchase Order Problem - Cannot Approve PO

We are having an issue with Approving PO's. When a PO it set for Pending Approval, we do not have the option to Approve the PO (but do still have the option to Submit for Approval). I have verified and all of our technicians are set with the SDAdmin Role, which I believe should have this ability. We can edit the database directly and it will approve then, but not though the software.

We are running Build 7013, but I believe we had this issue with 7011. We are running MSSQL for the database.

I tried this out on the Demo Page (created a user with SDAdmin rights and logged in and viewed a PO and did not have an option to approve there as well)....am I missing something? Any suggestions are appreciated.

Thanks,
Derek