Repeat after me

"RMAN catalog database should always be different from the target database"
"RMAN catalog database should always be different from the target database"
"RMAN catalog database should always be different from the target database"
"RMAN catalog database should always be different from the target database"
"RMAN catalog database should always be different from the target database"
"RMAN catalog database should always be different from the target database"
"RMAN catalog database should always be different from the target database"

Now does that make sense.