When the message is used to advise the status of a cancellation of an MT 500 Instruction to Register, an MT 519 Modification of Client Details, field 20C Reference in subsequence A1 Linkages must contain the reference of the cancellation request.
When the message is used to advise the status of an instruction of an MT 500 Instruction to Register, an MT 519 Modification of client details, field 20C Reference in subsequence A1 Linkages must contain the reference of the instruction or modification.
The message can also be used to advise the status of the registration processing.