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Article Preamble571 Cases
Article 1.117 Cases
Article 1.29 Cases
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Article 1.911 Cases
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Article 2.1.116 Cases

(1) A reply to an offer which purports to be an acceptance but contains additions, limitations or other modifications is a rejection of the offer and constitutes a counter-offer.
(2) However, a reply to an offer which purports to be an acceptance but contains additional or different terms which do not materially alter the terms of the offer constitutes an acceptance, unless the offeror, without undue delay, objects to the discrepancy. If the offeror does not object, the terms of the contract are the terms of the offer with the modifications contained in the acceptance.

Number Issue # Cases
1 Modified acceptance 2
1.1 Constituting counter-offer
1.2 Constituting acceptance where modifications not material and not objected to by offeror. 5
1.2.1 Examples of non-material modifications 1
1.2.2 Example of material modifications
2 Difference with writings in confirmation (see Art. 2.1.12)
3 Difference with battle of forms (see Art. 2.1.22)
Article 2.1.123 Cases
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Article 2.1.1510 Cases
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Article 2.1.195 Cases
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Article 2.2.90 Cases
Article 2.2.101 Cases
Article 3.1.10 Cases
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Article 3.2.12 Cases
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Article 3.2.56 Cases
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Article 3.2.100 Cases
Article 3.2.111 Cases
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Article 3.3.10 Cases
Article 3.3.22 Cases
Article 4.138 Cases
Article 4.215 Cases
Article 4.335 Cases
Article 4.47 Cases
Article 4.511 Cases
Article 4.618 Cases
Article 4.72 Cases
Article 4.88 Cases
Article 5.1.15 Cases
Article 5.1.212 Cases
Article 5.1.322 Cases
Article 5.1.49 Cases
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Article 7.1.112 Cases
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Article 7.1.311 Cases
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Article 8.10 Cases
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Article 9.1.10 Cases
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Article 9.1.102 Cases
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Article 9.1.131 Cases
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Article 9.1.150 Cases
Article 9.2.12 Cases
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Article 9.2.31 Cases
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Article 9.2.52 Cases
Article 9.2.60 Cases
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Article 9.2.80 Cases
Article 9.3.10 Cases
Article 9.3.20 Cases
Article 9.3.32 Cases
Article 9.3.42 Cases
Article 9.3.50 Cases
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Article 9.3.70 Cases
Article 10.11 Cases
Article 10.24 Cases
Article 10.30 Cases
Article 10.41 Cases
Article 10.50 Cases
Article 10.61 Cases
Article 10.70 Cases
Article 10.80 Cases
Article 10.92 Cases
Article 10.100 Cases
Article 10.110 Cases
Article 11.1.12 Cases
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Article 11.1.60 Cases
Article 11.1.70 Cases
Article 11.1.80 Cases
Article 11.1.90 Cases
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Article 11.1.110 Cases
Article 11.1.120 Cases
Article 11.1.130 Cases
Article 11.2.11 Cases
Article 11.2.20 Cases
Article 11.2.30 Cases
Article 11.2.40 Cases