Found on the Additional data tab.
When you revise [modify] a lease, in most cases it needs to be retested for finance vs. operating, both from the lease inception date and separately as of the revision date. Therefore, you're required to enter an incremental borrowing rate, implicit rate (calculated automatically by EZLease if applicable), unguaranteed residual (if known), economic life, and fair value to enable testing. The Revision Booking Date is the date as of which the revision should be entered onto the books.
EZLease automatically determines the Date of First Change which is the date as of which the first change in terms takes effect. This set of fields is not available when first entering a new lease.