Absence Plan Balance Automatic transfer to new plan

Hi Team,

We are able to achieve the result by using Plan Category and running the Enrollment and Accrual process.

However one guidance required: -

1. We don't want manual intervention so to have scheduled the process on daily basis
2. What if someone changes the assignment backdated which result in Plan ineligibility of existing plan and new plan is eligible. But as the date is past how the system will behave as if the Enrollment happens as on sysdate then balance transfer won't work automatically?

Need guidance on the 2nd point.

Regards

Amar