SAP ABAP Message Number IUID - 021 (IUID) is used by

• Class (3)

#	Object Type	Object Name	Object Description	Package	Structure Package	Software Component
1	Class	CL_IUID_EQUI Method: CHECK_IUID_FIELDS	IUID Equipment changes	IUID	APPL	SAP_APPL
2	Class	CL_UID_IUID Method: CREATE_UII	IUID Engine Class	IUID	APPL	SAP_APPL
3	Class	CL_UID_IUID Method: CHECK_UII	IUID Engine Class	IUID	APPL	SAP_APPL