Need multiple approvals through email on Oracle generated Purchase Orders.

Hi Experts,

Our client requirement is to get approval of 6 persons through email against single document Oracle generated Purchase Order / Purchase Requisition as well as to record and maintain the history of approval actions over Oracle generated document (Purchase Order / Purchase Requisition).

Further more we've a little concern about oracle user accounts, as we've currently 5 Oracle user accounts and we need to give data entry access to four (4) persons and Approval access to six (6) persons through email. Our concern is that, do we have to give Oracle user account access to the persons who are delegated for approval purpose through email only?