Hello
This is what I see from the log.
ORA-19625: error identifying file /oracle/SID/sapbackup/belokcak.spa/sr3.data25
ORA-27041: unable to open file
IBM AIX RISC System/6000 Error: 22: Invalid argument
Additional information: 2
Can you check the file permissions and ownership in the .spa directory when the backup is running ?
Also check the ownership of the datafile /oracle/SID/sapdata1/sr3_25/sr3.data25 and the rest of the files
Additionally check whether the orasid and sidadm are part of the dba and oper groups.
Regards
RB