Message Class list used by SAP ABAP Program SAPMSD20 (Matchcode Object: Attribute)
SAP ABAP Program SAPMSD20 (Matchcode Object: Attribute) is using
# Object Type Object Name Object Description Note
     
1 Message Class  AD Data Dictionary application messages
2 Message Class  E2 DE Data Dictionary
3 Message Class  MC Aggregate: views, matchcodes, lock objects