Insufficient Funds condition in Requisition Approval rule

Overview: Business is using 'Advisory' control and have prepared a budget for various COA combinations. Along with actual budget, they use 5% tolerance on top of it which has been setup in control budget.

Now the requirement is if the requisition amount is under the tolerance limit (exceeding the actual budget but not exceeding tolerance) such requisitions should be approved by one set of users and if the tolerance limit is also exceeded along with Actual budget amount, such requisitions must be approved by regular Requisition Approvers and if the requisition amount is over the budget tolerance amount, then such requisitions must be routed to Finance Directors and not regular approvers.