Explanation
MetaTrader 5 says a deal is the commercial exchange of buying or selling. Buying is at the Ask and selling is at the Bid. A deal follows a market order or a triggered pending order, and an order can result in several deals. If there is no position in the symbol, the deal opens one. If there is already a position, the deal can increase it, reduce it, close it or, in the netting system, reverse it. A deal is a fill. It is not the profit or loss, which depends on the later closing deal.
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Sources and last check
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