SAP ABAP Message Number 01 - 305 (01) is used by

• Function Module (3)

#	Object Type	Object Name	Object Description	Package	Structure Package	Software Component
1	Function Module	SUSR_USER_EXTID_DEL	SUSR_USER_EXTID_DEL	SUSR	BASIS	SAP_BASIS
2	Function Module	SUSR_USER_EXTID_SET	SUSR_USER_EXTID_SET	SUSR	BASIS	SAP_BASIS
3	Function Module	SUSR_USER_MAINT_WITH_DIALOG	User: Create with dialog	SUSR	BASIS	SAP_BASIS