An extra charge is a charge against a tenant. Up until now the date of the extra charge had to either today or earlier. Now you can create future dated extra charges.
These come with a warning however. A future dated extra charge is not added to the tenants balance until the date of the extra charge is reach. It is as if it is not there. Most reports such as the New Zealand Tenancy Services report will ignore these transactions. If a tenant pays towards a future dated extra charge, they will be temporarily in credit until the extra charge gets applied. And if a tenant ends their tenancy before the extra charge date, it will never get applied to that tenant.