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Mandatory in mandatory sequence A
If the Receiver of this message has previously sent an MT 768 Acknowledgement of a Guarantee/standby Message or its equivalent, this field contains the contents of field 20 Transaction Reference Number of the acknowledgement. If no acknowledgement was previously received, this field will contain a reference which is meaningful to the Receiver, for example, the undertaking number.
This field must not start or end with a slash '/' and must not contain two consecutive slashes '//' (Error code(s): T26).