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Mandatory
This field specifies the number of this message in the series of messages sent for an undertaking amendment, and the total number of messages in the series.
Number and Total must have a value in the range 2 to 8 and Number must be less than or equal to Total (Error code(s): T75).
Number must have a value of 2 for the first MT 775, and must be incremented by 1 for each subsequent MT 775, up to a maximum of seven MTs 775.