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

• Class (4)

#	Object Type	Object Name	Object Description	Package	Structure Package	Software Component
1	Class	CL_PS_CUSTFIELD_HANDLER Method: READ_SINGLE_INSTANCE	PS HLP customer feild handler	PS_HLP_MD	EA-PLM	EA-APPL
2	Class	CL_PS_MD_UTIL Method: READ_MASS	Class holder to holder global values	PS_HLP_MD	EA-PLM	EA-APPL
3	Class	CL_PS_USERFIELD_HANDLER Method: READ_MASS	PS HLP User field handler	PS_HLP_MD	EA-PLM	EA-APPL
4	Class	CL_PS_USERFIELD_HANDLER Method: READ_SINGLE_INSTANCE	PS HLP User field handler	PS_HLP_MD	EA-PLM	EA-APPL