Message Class list used by SAP ABAP Program RCNV0001 (DD: Convert EDIDD to structure and copy old data)
SAP ABAP Program RCNV0001 (DD: Convert EDIDD to structure and copy old data) is using
# Object Type Object Name Object Description Note
     
1 Message Class  D0 Machine-level ABAP/4 Dictionary texts (e.g. debugging)
2 Message Class  IU Incremental conversion