SAP ABAP Program ST20_MAIN (Include ST20_MAIN) is using

• Class (3)
• Table/Structure Field (6)
• Function Module (1)
• Message Class (1)
• Message Number (1)
• Class Method (2)
• Table (2)
• Transaction Code (3)

#	Object Type	Object Name	Object Description	Note
1	Class	CL_GUI_FRONTEND_SERVICES	Frontend Services
2	Class	CL_GUI_SIMPLE_TREE	Simple Tree Control
3	Class	CL_TREE_CONTROL_BASE	Internal Tree Control Class