Restrict Reassign LOV to specific users in Supplier Regisration Approval

Summary:

In oracle fusion supplier registration process, once a supplier registration request is submitted , it is routed through an approval workflow. When approvers receive the approval notifications, they have the option under actions to Reassign or delegate the approval to another user. Currently , the system allows the approver to reassign the request to any user available in the system. However, we want to restrict this functionality so that the reassignment can be done only to a specific group of users. The remaining users should not appear in the LOV during reassigmnet. Please let us know how this restriction can