Via the field "Tenant" you can set a tenant for a lease. Once you have set a tenant for a lease, you must set a debit address for the lease via the fields called "Debit address from" and "Debit address type".
For more information on how to:
set a tenant for a lease, see the section "Set a tenant for a lease"
set a debit address for a lease, see the section "Set a debit address for a lease"