Oracle Error Message
RMAN-06416: PROXY ONLY was specified and some files could not be proxy copied
Reason for the Error
PROXY ONLY was specified, and some of the files to be backed up could not be backed up by the media management software used by the target database. Message 6415 is issued for each file that cannot be proxy copied.
Solution
Remove the ONLY option to place the files into a regular backup set, or contact the media management vendor if you believe that the media management software should support proxy copy of these files.