25B [Definition of fundamental breach: substantial deprivation of expectation, etc.];

26A1 [Effective definition of avoidance: notice to other party required];

39A2 [Requirement to notify seller of lack of conformity: buyer must notify seller within reasonable time];

49B1 [Buyer’s loss of right to declare avoidance after delivery: failure to avoid within periods specified in art. 49(2)(a) and (b)]