The idea is that the Lease expiration/end date on General fast tab in Leases is also applied on both payment schedule lines and executory costs schedule payment lines.

Users should be able to maintain lease start date & lease expiry date in the lease master in MSD, but still should not have a payment line start date with a date beyond lease expiry date. That way the system restricts any payment which has a date plotted after lease expiry date thus acquiring better control in lease accounting & master data.