The reply to an offer meant to be an acceptance thereof, but containing
additions, limitations or other amendments shall mean rejection of the offer and constitute a
counter-offer.
However, the response which is meant to be an acceptance but contains additional or different
elements, which do not substantially alter the terms of the offer,shall constitute an acceptance,
unless the offeror, without undue delay, disagrees with such elements. If he fails to do so, the
terms of the contract shall be those of the offer with amendments contained in the acceptance.
Unofficial translation
Spot-checked
In force from 15 December 2010
Source page 67