SAP Function /SAPCEM/SHIPDOC_USRFIELD_HEAD - Check Customer-Specific Fields per BusinessAddIn

Parameter	Reference	Type	Length	Default	Optional	Text
I_BELK	J_3GBELK	u	850			Document File - Header Data

Parameter	Reference	Type	Length	Text
E_BELK	J_3GBELK	u	850	Document File - Header Data
T_MESG	TSMESG	h	319	Message Table Message Collector