DislikedIMO, not if you had good reason at that time. If you know American football terminology, traders sometimes use the term "called an audible" to describe that: it's where the quarterback (play caller) overrides the play that the coach called in, because the opposing defensive setup is such that, in his opinion, the play called in has a low probability of success.Ignored
Although, I personally think it never hurts to mix things up on rare occasions since no system is perfect.