Hi Noemi,
Thanks for the screenshots. I understand the problem now. Lets try this:
1) If you try to execute the same statement from the screenshot above from command line tool dbmcli, does it work ? let me know
"dbmcli -d SS1 -n <hostname> -uUTL -tpi <SID> -tpp no_longer_used -tpc <SID> backup_start CVBackup_full RECOVERY DATA AUTOIGNORE"
Are you SAP Customer ?
Regards, Yashwanth