When a requisition is sent for approval to different operators set up in the job requisition route map, you might want to introduce an ad-hoc approver for business needs.
SAP SuccessFactors Recruiting Management - All versions
The V role defines the permissions a recruiting user receives when viewing the record, if the system cannot identify another operator associated with them. For example, if the requisition is routed to an unrelated user to approve, that approval user would receive V permissions.
So, for adding an ad-hoc approver, modify the job requisition template to add a user role V and grant read/write permissions to different requisition fields as you would want the ad-hoc approver to view/edit in the requisition approval process.
Ad-hoc approvers ; Adhoc approvers , KBA , LOD-SF-RCM-RBP , Roles & Permissions , How To