Trades are independent, they don't care about charts at all. You can open a trade at any symbol without any chart. Look below - I have no charts and I can still hit New Order and make a new trade.
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When backtesting, it appears that the trades belong to the chart, as you can see their arrows and lines. On live you don't even see those arrows. The EA just sends command to the server to open a trade for USDJPY or EURUSD, and the server does that. Charts are only to see the price... and to put indicators and expert advisors on them. Charts are outputs, they show information. But trades does not belong to charts.