In many instances, SWIFT message types between custodians follow the ISO standard.
This is followed by a three-digit number that denotes the message category, group and type.
[3] For example, an asset manager who executed a FX transaction with a broker would send a MT304 instruction to the custodian bank of the client.
[4] The table below shows the different categories and the message type descriptions.
Although ISO 15022 message types are different in their structure than the SWIFT MT, the naming convention remains the same.