SAP ABAP Data Element AD_CUSAGE (Communication Usage: Key Field) is used by

• Class (20)
• Function Module (10)
• Interface (1)
• Program (17)
• Table (21)

#	Object Type	Object Name	Object Description	Package	Structure Package	Software Component
1	Program	LBUA0TOP	Include LBUA0TOP	BUPA	ABA	SAP_ABA
2	Program	LBUPA_INTERFACE_SERVICETOP	LBUPA_INTERFACE_SERVICETOP	BUPA_INTERFACE	ABA	SAP_ABA
3	Program	LBUPA_MASSDATA_SELECTTOP	LBUPA_MASSDATA_SELECTTOP	BUPA	ABA	SAP_ABA
4	Program	LSUID_MAINTENANCETOP	LSUID_MAINTENANCETOP	SUSR_MAINT	BASIS	SAP_BASIS
5	Program	LSZA0F65	Include LSZA0F65	SZAD	BASIS	SAP_BASIS
6	Program	LSZA0F81	Include LSZA0F81	SZAD	BASIS	SAP_BASIS
7	Program	LSZA0TOC	Global constants for all dev.cl. SZAD function groups	SZAD	BASIS	SAP_BASIS
8	Program	LSZA0TOP	Global function group data (incl. global macro definitions)	SZAD	BASIS	SAP_BASIS
9	Program	LSZA6F18	Include LSZA6F18	SZAD	BASIS	SAP_BASIS
10	Program	LSZA6F19	Include LSZA6F19	SZAD	BASIS	SAP_BASIS
11	Program	LSZA6F21	Include LSZA6F21	SZAD	BASIS	SAP_BASIS
12	Program	LSZA6F23	Include LSZA6F23	SZAD	BASIS	SAP_BASIS
13	Program	LSZA6F26	Include LSZA6F26	SZAD	BASIS	SAP_BASIS
14	Program	LSZA6F31	Include LSZA6F31	SZAD	BASIS	SAP_BASIS
15	Program	LSZA6O02	PBO modules for screens 1020, 1030, ...	SZAD	BASIS	SAP_BASIS
16	Program	LSZA6O08	Include LSZA6O08	SZAD	BASIS	SAP_BASIS
17	Program	LSZA6TOP	Include LSZA6TOP	SZAD	BASIS	SAP_BASIS