UN/EDIFACT Syntax Version 3 Revision 1997A Service Code List

	Description	Repr
0001	Syntax identifier	a4
0002	Synatx version number	an1
0007	Partner identification code qualifier	an..4
0025	Recipient's reference/password qualifier	an2
0029	Processing priority code	a1
0031	Acknowledgement request	n1
0035	Test indicator	n1
0051	Controlling agency	an..2
0052	Message version number	an..3
0054	Message release number	an..3
0065	Message type identifier	an..6
0073	First/last sequence message transfer indication	a1
0081	Section identification	a1
0083	Action, coded	an..3
0085	Syntax Error, coded	an..3

Change indicators
plus sign		An addition.
asterisk		Addition/substraction/change to a code entry for a particular data element.
hash or pound sign		Changes to names.
vertical bar		Changes to text for descriptions, notes and functions.
minus sign		A deletion.
letter X		Marked for deletion.