Mandatory
This field contains the sequential number of the statement, optionally followed by the sequence number of the message within that statement when more than one message is sent for the statement.
The statement number should be reset to 1 on 1 January of each year.
If used, the sequence number always starts with 1. When several messages are sent to convey information about a single statement, the first message must contain '/1' in Sequence Number.
The sequence number must be incremented by one for each additional message.
Both the statement number and sequence number enable the Receiver to put the different messages into sequence and thus form the complete statement.