UNB -

Interchange header
UN/EDIFACT Syntax Version 4 Release 1 Segment List

	Function:	To identify an interchange.
	This segment also occurs in the following versions of this standard: 30000, 40000, 40100

Pos			M/C	Repeat	Repr.
010	S001	SYNTAX IDENTIFIER	M	1
	0001	Syntax identifier	M		a4
	0002	Syntax version number	M		an1
	0080	Service code list directory version number	C		an..6
	0133	Character encoding, coded	C		an..3
020	S002	INTERCHANGE SENDER	M	1
	0004	Interchange sender identification	M		an..35
	0007	Identification code qualifier	C		an..4
	0008	Interchange sender internal identification	C		an..35
	0042	Interchange sender internal sub-identification	C		an..35
030	S003	INTERCHANGE RECIPIENT	M	1
	0010	Interchange recipient identification	M		an..35
	0007	Identification code qualifier	C		an..4
	0014	Interchange recipient internal identification	C		an..35
	0046	Interchange recipient internal sub-identification	C		an..35
040	S004	DATE AND TIME OF PREPARATION	M	1
	0017	Date	M		n8
	0019	Time	M		n4
050	0020	Interchange control reference	M	1	an..14
060	S005	RECIPIENT'S REFERENCE/PASSWORD DETAILS	C	1
	0022	Recipient reference/password	M		an..14
	0025	Recipient reference/password qualifier	C		an2
070	0026	Application reference	C	1	an..14
080	0029	Processing priority code	C	1	a1
090	0031	Acknowledgement request	C	1	n1
100	0032	Interchange agreement identifier	C	1	an..35
110	0035	Test indicator	C	1	n1

Notes:
Pos	Position
M/C	Mandatory or Conditional
Repr.	Representation (Data or Content Type)
1.	S001/0002, shall be '4' to indicate this version of the syntax.
2.	The combination of the values carried in data elements S002, S003 and 0020 shall be used to identify uniquely the interchange, for the purpose of acknowledgement.

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.