Basically, unrealized gross profit is not an asset, liability,
expense, revenue and owner equity.
Because asset always record in DR side as a nature.
Liability record on CR side but we don't have to pay any thing
in unrealized gross profit.
expense nature is DR
revenue nature is CR but unrealized gross profit is expected to
be an income after realizing.
owner equity means to invest in business and unrealized gross
profit is not an investment.
So, we have to assume the unrealized gross profit as liability
because it is mutually unearned. Unearned, it is an advance amount
which is liability until we earned it. Similarly, unrealized is
expected to be earned in future after collecting the installments
of sales, as unearned is a part of liability so, unrealized gross
profit is also a part of liability through unearned account.