SAP ABAP Table DD28J (Internal structure for joins of views) is using

• Data Element (13)

#	Object Type	Object Name	Object Description	Note
1	Data Element	CHAR1	Single-Character Flag
2	Data Element	DDJCONSTANT	DD: Literals in the On condition
3	Data Element	DDVIEWJFLD	Field name
4	Data Element	DDVIEWJFLD	Field name
5	Data Element	DDVIEWJTAB	Table Name
6	Data Element	DDVIEWJTAB	Table Name
7	Data Element	FIELDNAME	Field Name
8	Data Element	FORDIR	Direction of Foreign Key Dependency
9	Data Element	JOPERATOR	DD: Join Operator; Example: INNER JOIN, LEFT OUTER JOIN
10	Data Element	TABNAME	Table Name
11	Data Element	VIEWNAME	Name of SAP table view
12	Data Element	VOPERATOR	Operator in a selection condition (screen field)
13	Data Element	VSOPERATOR	Operator in a Join Condition