Installment forcast or matureness
Suppose you buy a Computer for $1000 worth by incurring a credit card installment of 10 payments of $100.
The computer value imediately becomes part of you Fixed Assets, and you incurred a debt of $ 1000.
After the first payment you have a Fixed Asset of $1000, a debt of $900 and $100 on equity.
This feature would help you to realize what are the sources of resources compoundig your Assets, as well would help you to track future expenses, make a true financial planning and is completely different of schedulled transactios for at least two reasons: first, by a accrual basis you purchased something and incurred a debt at the same moment. Second, because thhere's need to know how much you truely owns the purchased stuff.
In fact, this can be solved writing the future payment day at the column Date and the purchased date enters as description.
In short, the gnucash as it is today "lacks a column" of matureness, or pay day date.
No, this is exactly the scenario that Scheduled Transactions are designed for. You add the asset balanced by the liability, then create an SX to make the payments according to the schedule. There’s even a Mortgage Assistant to help you set everything up.