This message is sent in one of two ways:
by the beneficiary when the beneficiary is a financial institution
by a nominated advising party that advised the undertaking amendment to the beneficiary or advised the undertaking amendment to another advising party
It is sent to the bank that issued the undertaking amendment (guarantee, demand guarantee, standby letter of credit or dependent undertaking), either directly or via one or more advising parties, to indicate acceptance or rejection by the beneficiary of the amendment.