Hi Krishna,
The basic steps of Homogeneos system copy, the SAP Note No. 129352, are :
a) Create the complete data backup of the MAXDB database on the source system;
b) Copy the complete databackup to the target server & use the option 'Recovery with Initialization' to restore the databackup on the target.
c) Follow the note further and do c), d) & e) steps.
You wrote, that change the schema using the command "dbmcli -d <NEWSID> -u control,control -uSQL superdba,admin".
Please check the SAP Note No. 129352, step e), with the written by you command you will get the SQL connection session as SUPERDBA user, if the DBM user of the database is control with the default password control, and the SYSDBA user/pwd of the target database is superdba/admin. Please run the SQL statement "rename user SAP<SID> to SAP<NEWSID> " to rename the database user or
" dbmcli -d <NEWSID> -u control,control -uSQL superdba,admin sql_execute rename user SAP<SID> to SAP<NEWSID>"
Hope this helps.
Regards,
Deepak Kori