Message Oracle RMAN-06808 - SECTION SIZE cannot be used when piece limit is in effect

ERRORSECTION SIZE cannot be used when piece limit is in effect
CAUSEThe SECTION SIZE backup option was used together with the MAXPIECESIZE channel limit. These options are mutually exclusive, because they are independant methods of creating multiple backup pieces with one backup command.
ACTIONUse one option or the other, but not both.