Account.c

{
    gnc_numeric bal = gnc_numeric_zero ();
    GValue v = G_VALUE_INIT;
    g_return_val_if_fail(GNC_IS_ACCOUNT(acc), FALSE);
    qof_instance_get_kvp (QOF_INSTANCE(acc),
                          "reconcile-info/postpone/balance", &v);
    if (!G_VALUE_HOLDS_INT64 (&v))
        return FALSE;

    bal = *(gnc_numeric*)g_value_get_boxed (&v);

    if (!bal.denom)
        return FALSE;

    if (balance)
        *balance = bal;

    return TRUE;
}