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Trades can be reversed by means of a countertrade using the Two-sided Trade Report or the One-sided Trade Report functions. Countertrades are trade reports with the same trade details as the original trade, but with the sides reversed. There are no time restrictions on countertrades; they can be reported to the exchange at any time during the business day. Countertrades are published in the market data via MDDX as trade cancellations and reduce the volume.

Do countertrades have to be marked specially?

Countertrades must be marked using the "Special Price" trade type and contain the unique reference (Trade ID) of the original trade.