SAP Function TXS_EXTRACT_TABLE_CHECK - Check if such a table extract exists already

Parameter	Reference	Type	Length	Default	Optional	Text
I_REFTAB	TXX_REF_TAB	C	30			Reference Table
I_SEGNAME	TXX_SEGNAME	C	30			Segment Name

Exception	Text
NO_CHAR	invalid field format
NO_FIELD	no matching fields