Message Number list used by SAP ABAP Program MF21CFAA (General Form Routines (Hierarchies))
SAP ABAP Program MF21CFAA (General Form Routines (Hierarchies)) is using
# Object Type Object Name Object Description Note
     
1 Message Number  GK - 020 System error occurred during lock management
2 Message Number  GK - 021 &1 &2 is already being processed by user &3