Client Support - Sevana Hospital

There should be a provision to reject approved stock requisition to stores. OR there should be a provision to map location to users rather than user groups.
Scenario: All Nurses assigned with user group NURSE which holds all nursing locations. While sending stock requisitions there can be chances nurse wrongly select location and eventually approve the requisition with wrong location.
Solution 1: If the store manager has rights to reject such requisitions the list becomes up to date.
Solution 2: If location assignment moved from user group to user, then the user will see only the designated location(s).

Give us either solutions or any better one to address this scenario.