回测时passorder执行后，账户可用金额m\_dAvailable数目不对？

刚用QMT不久，回测时发现passorder执行后，重新get_trade_detail_data获取账户可用余额m_dAvailable，和预期的余额不一样。

代码片段如下，初始资金=1000000元, 初始日期20200601以3.959元买入126200股510300.SH, 以141.076元买入3500股511010.SH, 应该剩余现金6608.20元。

而下单完成后, get_trade_detail_data查询结果显示持仓符合预期holdings={'510300.SH': 126200, '511010.SH': 3500}，但可用资金=96790.75元。之后每一天的查询结果也都是可用资金=96790.75元。有没有人指点下这个数怎么来的呢？？ 佣金印花税也都正确设置了。

def init(C):
    C.accountid = "testAccount"  # 回测默认账户
    C.strategy_state = {
        'stock_code': "510300.SH",
        'bond_code': "511010.SH",
        'initialized': False,
    }
    print(f"策略初始化完成: 账户={C.accountid} 初始资金={C.capital} 股票={C.strategy_state['stock_code']} 债券={C.strategy_state['bond_code']}")

def handlebar(C):
    current_date_str = timetag_to_datetime(C.get_bar_timetag(C.barpos), '%Y%m%d')
    current_date_dt = datetime.datetime.strptime(current_date_str, '%Y%m%d')
    state = C.strategy_state
    account_info = get_trade_detail_data(C.accountid, 'STOCK', 'ACCOUNT')
    available_cash = account_info[0].m_dAvailable
    balance = account_info[0].m_dBalance

    if not state['initialized']:
        prices = C.get_market_data_ex(['close'], [state['stock_code'], state['bond_code']], period='1d', count=1, subscribe=False)
        stock_price = prices[state['stock_code']].iloc[0, 0]
        bond_price = prices[state['bond_code']].iloc[0, 0]
        total_cash = available_cash
        stock_value = total_cash * 0.5
        bond_value = total_cash * 0.5
        stock_vol = max(100, int(stock_value / stock_price / 100) * 100)
        bond_vol = max(100, int(bond_value / bond_price / 100) * 100)
        stock_cash_used = stock_vol * stock_price
        bond_cash_used = bond_vol * bond_price
        cash_remaining = total_cash - stock_cash_used - bond_cash_used
        print(f"{current_date_str} 初始配置: 总资产={balance}元, 可用资金={total_cash}元. 即将以{stock_price}元买入{stock_vol}股{state['stock_code']}, 市值{stock_cash_used:.2f}元; 以{bond_price}元买入{bond_vol}股{state['bond_code']}, 市值{bond_cash_used:.2f}元; 剩余现金{cash_remaining:.2f}元")

        if stock_vol > 0:
            passorder(23, 1101, C.accountid, state['stock_code'], 5, -1, stock_vol, C)
        if bond_vol > 0:
            passorder(23, 1101, C.accountid, state['bond_code'], 5, -1, bond_vol, C)

        state['initialized'] = True

        account_info = get_trade_detail_data(C.accountid, 'STOCK', 'ACCOUNT')
        positions = get_trade_detail_data(C.accountid, 'STOCK', 'POSITION')
        holdings = {}
        if positions is not None:
            for pos in positions:
                code = pos.m_strInstrumentID + '.' + pos.m_strExchangeID
                holdings[code] = pos.m_nVolume
        print(f"下单完成后, 最新查新结果为总资产={account_info[0].m_dBalance:.2f}元, 可用资金={account_info[0].m_dAvailable:.2f}元, holdings={holdings}")

        return

问题已解决。函数参数设置的不正确。