SAP ABAP Program ICN__F04 (Repository Infosystem: Unused Message Classes) is using

• Table/Structure Field (6)
• Table (3)

#	Object Type	Object Name	Object Description	Note
1	Table	CROSS	Index of Modules Used Externally
2	Table	T100A	Message IDs for T100
3	Table	TRDIRE	Program attributes (from PROGRAM statement)