SAP ABAP Message Number CUIB1 - 021 (CUIB1) is used by

• Class (1)
• Function Module (2)

#	Object Type	Object Name	Object Description	Package	Structure Package	Software Component
1	Class	CL_CU_CBASE_ENQUEUE_CORE Method: SET_ENQUEUE	CU: Lock Instances	CUIB_CORE	APPL	SAP_APPL