Cancel Order action at the same day as the derivative bought

, ,
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Imported from previous forum

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If the buy-side bought a derivative, (the order is fully completed) and in the end of the same day the buy-side want to cancel the derivative bought. Is there any “regret” process in a case like this?
i mean to a process that not requires to get a new bid price but cancel the derivative bought in the same price of the order.

Thanks