SAP ABAP Table MCDEFID (Default matchcode Ids per user) is used by

• Function Module (1)
• Program (2)

#	Object Type	Object Name	Object Description	Package	Structure Package	Software Component
1	Program	LSUSXTOP	LSUSXTOP	SUSR	BASIS	SAP_BASIS
2	Program	RADBTDL2	DD: Generalized Deletion of Set (Include)	SMAC	BASIS	SAP_BASIS