Purchase requisition Approval - Switching between FSM and BPM

Summary:

The Purchase requisition Approvals is bit complex and for certain scenarios we need to use BPM

FSM is easy to configure but in BPM we have to pass all the back end values (ID's) and for complex rules we need to use only BPM

In our case ,we have more than 50 rules out of which only for 5 rules ,we need to direct the approvals through DFF attribute which can be done only using BPM but for the rest 45 rules we can derive using FSM - Manage Requisition Approvals screen .

So we are planning to configure the rules whichever is possible through FSM and for complex rules we will switch to BPM .When we switch between FSM and BPM do we need to created the rules freshly every time or will any corruption happens if we switch frequently .