SAP ABAP Data Element KEY (Synchronization key) is used by

• Class (9)
• Function Module (1)
• Program (1)
• Table (3)

#	Object Type	Object Name	Object Description	Package	Structure Package	Software Component
1	Class	CL_FCOM_IP_IOBJ_ACCESS Method: FILL_CHAVLINFO_FROM_TEXT	Read Master Data of InfoObject from DataSource	FCOM_PLANNING_CORE	APPL	SAP_FIN
2	Class	CL_FCOM_IP_IOBJ_ACCESS Method: FILL_CHAVLINFO_FROM_ITAB	Read Master Data of InfoObject from DataSource	FCOM_PLANNING_CORE	APPL	SAP_FIN
3	Class	CL_FCOM_IP_METAINFO Method: IF_FCOM_IP_METAINFO~CREATE_DATA_REFERENCE	Metadata About InfoObject Properties	FCOM_PLANNING_CORE	APPL	SAP_FIN
4	Class	CL_USMD_MDF_DB_ADAPTER Method: REPLACE_FLDNM_STRUC_DB2A_P	Adapter Class for MDF	USMD1B	MDG_FND	MDG_FND
5	Class	CL_USMD_MDF_DB_ADAPTER Method: REPLACE_FLDNM_STRUC_P	Adapter Class for MDF	USMD1B	MDG_FND	MDG_FND
6	Class	CL_USMD_MDF_HRY_ADAPTER Method: CREATE_DATREF_EDGE_DATA_P	Hierarchy Adapter Class MDF	USMD1B	MDG_FND	MDG_FND
7	Class	CL_USMD_MODEL Method: PREPARE_DERIVE_ENTITY_P	MDM Data Model	USMD1A	MDG_FND	MDG_FND
8	Class	CL_USMD_MODEL Method: READ_CHAR_VALUE_COMBINE_P	MDM Data Model	USMD1A	MDG_FND	MDG_FND
9	Class	CL_USMD_PP_ACCESS_ADAPTER Method: CREATE_BASE_FLD_TAB_P	Adapter for Access to Active Area	USMD1	MDG_FND	MDG_FND