A (sub)contractor must give notice of a potential (time or money) claim – or loose the opportunity to claim – during the construction process when he (ought to) become aware thereof to prevent claims accumulating until the final account stage when their validity may be more difficult/impossible to assess

See: 6.1P-26.5; 5.0P-32.6; 6.1N-26.5; 5.0N-32.5