Hi Jamal
This has been raised a few times and SAP do not have it as a proposed list of enhancement. Their recommendation is to implement SSO. Please refer to the following information in Ideas Place where it was raised
One of the SCN discussions for wanting Approvers to use End User Logon Authentication for approval - Authenticate Approvers using LDAP Credentials
The idea rejected by SAP where they have advised to use SSO, The main reason for there rejction is that it would be a change to the actual SAP logon authentication and that approvers still need SU01 account for Workflow and authorisations. - Approvers authentication to be based on a data source instead of GRC SU01 : View Idea
Current Idea (I raised after discussion with SAP) as an extension to SSO (needs 10-15 votes to even be considered) - GRC Approver for Reaffirm Requests to authentication against Data Sources : View Idea
Regards
Colleen