SAP ABAP Message Number 01 - 639 (01) is used by

• Class (4)

#	Object Type	Object Name	Object Description	Package	Structure Package	Software Component
1	Class	CL_IDENTITY Method: AUTH_CHECK_FOR_NEW_CLASS	Identity Class	SUSR_IDENTITY	BASIS	SAP_BASIS
2	Class	CL_IDENTITY Method: ROLES_GET_COLLECTION_ELEMENTS	Identity Class	SUSR_IDENTITY	BASIS	SAP_BASIS
3	Class	CL_IDENTITY Method: CHECK_ROLES_INTERNAL	Identity Class	SUSR_IDENTITY	BASIS	SAP_BASIS
4	Class	CL_SUID_TOOLS Method: AUTH_CHECK_SINGLE	Help Class: Authorization Checks for Identities	SUSR_IDENTITY	BASIS	SAP_BASIS