SAP ABAP Table T100A (Message IDs for T100) is used by

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#	Object Type	Object Name	Object Description	Package	Structure Package	Software Component
1	Class	/BOFU/CL_BAL_BUFFER Method: CHECK_T100_MSG	Application Log: Buffer Class	/BOFU/BAL_BO	BS_REUSE	SAP_BS_FND
2	Class	/TDAG/CP_IMDS_AICL_XML Method: GET_PHRASE_FOR_MATERIAL	IMDS XML Generator	/TDAG/CP_IMDS_AI	/TDAG/CP_IMDS	TDAGBCA
3	Class	CL_ADT_MC_RES_CONTROLLER Method: DO_GET	T100 Message class resource controller	SMESSAGE_ADT	BASIS	SAP_BASIS
4	Class	CL_ADT_MC_RES_CONTROLLER Method: DO_UPDATE	T100 Message class resource controller	SMESSAGE_ADT	BASIS	SAP_BASIS
5	Class	CL_ADT_MESSAGE_CLASS_API	T100 Message class APIs for CRUD	SMESSAGE_ADT	BASIS	SAP_BASIS
6	Class	CL_ADT_MESSAGE_CLASS_API Method: READ	T100 Message class APIs for CRUD	SMESSAGE_ADT	BASIS	SAP_BASIS
7	Class	CL_ADT_MESSAGE_CLASS_API	T100 Message class APIs for CRUD	SMESSAGE_ADT	BASIS	SAP_BASIS
8	Class	CL_ADT_MESSAGE_CLASS_API Method: UPDATE_MESSAGE	T100 Message class APIs for CRUD	SMESSAGE_ADT	BASIS	SAP_BASIS
9	Class	CL_ADT_MESSAGE_CLASS_API Method: UPDATE_CLASS	T100 Message class APIs for CRUD	SMESSAGE_ADT	BASIS	SAP_BASIS
10	Class	CL_ADT_MESSAGE_CLASS_API Method: READ_CLASS	T100 Message class APIs for CRUD	SMESSAGE_ADT	BASIS	SAP_BASIS
11	Class	CL_ADT_MESSAGE_CLASS_API Method: CREATE	T100 Message class APIs for CRUD	SMESSAGE_ADT	BASIS	SAP_BASIS
12	Class	CL_ASTRA_MSAG_INFO Method: IF_ASTRA_OBJECTS_INFO~GET_NUMBER_OF_SUB_OBJECTS	Info about Message Classes	SASTRA_MSAG	BASIS	SAP_BASIS
13	Class	CL_CRM_CHECK_RESULT Method: GET_T100_MSG_NBRS_OF_APP_AREA	OUTDATED: Replaced by CL_CRM_CHECK_RESULT_NEW	S_CHECK_RESULT_MANAGEMENT	BASIS	SAP_BASIS
14	Class	CL_FITV_IMG_UTILITIES Method: CHECK_MSGID_EXIST	General functions	PTRM_CUSTOMIZING	EA-TRAVEL	EA-HRGXX
15	Class	CL_IM_FIN_FSSC_CO_STATIC_PARA Method: IF_SSC_STATIC_PARA_TRANSFER~GET_SRCFLD_F4_VALUES	Class for BAdI: SSC_STATIC_PARA_TRANSFER	FIN_FSSC_SFWS_SC_1	APPL	SAP_FIN
16	Class	CL_IM_FIN_FSSC_STATIC_PARA_TR Method: IF_SSC_STATIC_PARA_TRANSFER~GET_SRCFLD_F4_VALUES	CL_IM_FIN_FSSC_STATIC_PARA_TR	FIN_FSSC_SFWS_SC_1	APPL	SAP_FIN
17	Class	CL_MDC_SALESPRICESPECRQ Method: PROCESS	Sales Price Specification ERP Bulk Creation Request Inbou	OPS_SE_MDC_XI_PROXY	APPL	SAP_APPL
18	Class	CL_OBJECT_COLLECTOR_CTS Method: IF_CRM_OBJECT_COLLECTOR~COLLECT_OBJECTS	CTS Object Collector for ToDo	S_CHECK_RESULT_MANAGEMENT_EXT	BASIS	SAP_BASIS
19	Class	CL_SIW_UTIL Method: MSG_TO_STRING	Diverse Utility Method	S_SIW_CORE	BASIS	SAP_BASIS
20	Class	CL_UI_CHECK_LOG Method: VALIDATE	UI for CL_JO_CHECK_LOG	ISAUTO_WTY_MP	EA-ISSE	EA-APPL
21	Class	CL_WER_STORAGE	For saving and loading from database	WER_PERSISTENCE	APPL	SAP_APPL