1.The right to commission can be extinguished only if and to the extent that:
it is established that the contract between the third party and the principal will not be executed, and
that face is due to a reason for which the principal is not to blame.
2.Any commission which the commercial agent has already received shall be refunded if the right to it is extinguished.
3.Agreements to derogate from paragraph 1 to the detriment of the commercial agent shall not be permitted.