SAP ABAP Message Number MPLAN - 023 (MPLAN) is used by

• Class (2)

#	Object Type	Object Name	Object Description	Package	Structure Package	Software Component
1	Class	MPLAN_CHECKS	Maintenance Plan Checks	MPLAN_API	APPL	SAP_APPL
2	Class	MPLAN_TOOLS	General Help Functions	MPLAN_API	APPL	SAP_APPL