Migrate exempt lease

Summary:

Good day,
Am trying to migrate an exempt lease from external systems to lease accounting, but whatever the date am selecting as the amortization start date the system ignores that date and default the lease start date.

this feature works with operating and finance leases as well as well the revenue leases, but am unable to migrate the exempt leases, so is there any reason for this behavior and if this not applicable what is the work around I can do to migrate the exempt leases?

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