SAP ABAP Program RLSUB020 (Inbound IDoc: Application documents linked with IDocs) is using

• Table/Structure Field (77)
• Function Module (10)
• Message Class (1)
• Message Number (2)
• Program (2)
• Table (19)
• Transaction Code (5)

#	Object Type	Object Name	Object Description	Note
1	Message Class	LK	WM -> SUB connection messages