TAG	NAME	MANDATORY	REPETITION
X926	Syntax version number	Ja	1
C900	Sender identification	Ja	1
X921	Sender domain address	Ja	1
X922	Sender user address	Neen	1
X927	Sender type, coded	Neen	1
C905	Recipient identification	Ja	1
X923	Recipient domain address	Ja	1
X924	Recipient user address	Neen	1
X928	Recipient type, coded	Neen	1
X925	Group type	Neen	1