A break of the level the trade was built on ⇐ the reason for entry no longer holds. Sometimes mislabeled as structural breakdown; the platform's term is Structural Invalidation.
What invalidation means
Structural Invalidation (Structural Invalidation) is the collapse of the foundation an idea was built on, not merely a loss in price. You bought because the price was above a holding Put Wall in a positive gamma regime? Then the wall breaking and the regime flipping is the invalidation. The thesis is dead even if your stop has not been hit yet.
The key difference from a stop-loss
A stop is a blind price line of defense: noise hits it as easily as truth does. Invalidation is a logical verdict: "the conditions I entered for no longer hold." The more mature of the two exits is invalidation before the stop. You leave because the reason is gone, not because the pain hit its limit.
Write it before entry, not after
Write it down with every trade as the sentence “This idea is invalid if…”. A break of a structural level on a close, a regime flip, no confirming flow within a set time. Written after entry, it gets tailored to your hope, not to logic.
Hypothetical example
A buy above the 5,000 wall on a bounce thesis. After three sessions the index closes below the wall and gamma turns negative. The price is still slightly above the stop, but the thesis is completely invalid. Exiting here is a decision of logic that pays off, even if it books a small loss.
Common mistake
Changing the thesis to stay in the position: you entered for a structural bounce, it failed, and you became a "long-term investor." Swapping the reason after buying is the best-known way small losing trades turn into disasters.
Where to see it on the platform
The trading journal records each trade's thesis and its invalidation condition. The gamma board shows you the moment the structural conditions you built on fail.
