Cannot

If a component's effect uses the word "cannot", that effect cannot be overruled by another game effect.

If a card or other game component's effects are in disagreement with each other and neither uses "cannot", the party may decide which to resolve and which to ignore.

This is one of the game's foundation rulesFoundation RulesThe rulebook and gazetteers are the definitive rules. When sources disagree, errata come first, then component text, the gazetteer, the rulebook and finally tutorials.Rulebook p. 10, which also set out which rules source wins when two disagree.

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Is the Rulebook considered a component that cannot be overruled?

The rulebook is not considered such a component. It can be overruled by other components that directly contradict it.

Source