UIH -

Interactive message header
UN/EDIFACT Syntax Version 4 Release 1 Segment List

	Function:	To head, identify and specify a message.
	This segment also occurs in the following versions of this standard: 40000, 40100

Pos			M/C	Repeat	Repr.
010	S306	INTERACTIVE MESSAGE IDENTIFIER	M	1
	0065	Message type	M		an..6
	0052	Message version number	M		an..3
	0054	Message release number	M		an..3
	0113	Message type sub-function identification	C		an..6
	0051	Controlling agency, coded	C		an..3
	0057	Association assigned code	C		an..6
020	0340	Interactive message reference number	C	1	an..35
030	S302	DIALOGUE REFERENCE	C	1
	0300	Initiator control reference	M		an..35
	0303	Initiator reference identification	C		an..35
	0051	Controlling agency, coded	C		an..3
	0304	Responder control reference	C		an..35
040	S301	STATUS OF TRANSFER - INTERACTIVE	C	1
	0320	Sender sequence number	C		n..6
	0323	Transfer position, coded	C		a1
	0325	Duplicate Indicator	C		a1
050	S300	DATE AND/OR TIME OF INITIATION	C	1
	0338	Event date	C		n..8
	0314	Event time	C		an..15
	0336	Time offset	C		n4
060	0035	Test indicator	C	1	n1

Notes:
Pos	Position
M/C	Mandatory or Conditional
Repr.	Representation (Data or Content Type)
1.	The value in 0340 shall be unique within the interchange (except for a duplicate transfer).
2.	The value(s) in S302 shall be identical to the value(s) in S302 in the preceding UIB.
3.	0035, when used, test applies to the message only.
4.	Dialogue control can be accomplished through the dialogue reference (S302). Optionally, if another means of control is chosen, this composite data element need not be utilised.
5.	A combination of 0340 and S302 may be used to identify uniquely a message.

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.