Backup & Recovery :: Delete Obsolete Backup From RMAN?

Environment: 2 Node Oracle(10.2.0.4.0) RAC on Aix 6.1.

Backups using RMAN utility.Our system is configured to take backups on Tape library using TSM server.

We take incremental level 1 backup on all days and Level 0 backup on Wednesday.We would like to keep the RMAN retention period of 14 days.I delete the backups that are 7 days old from the disk to save space and 14 days older backup from Tape.

I am getting below error in my RMAN backup logfiles.Also attached

RMAN-06207: WARNING: 147 objects could not be deleted for DISK channel(s) due
RMAN-06208: to mismatched status. Use CROSSCHECK command to fix status
RMAN-06210: List of Mismatched objects
RMAN-06211: ==========================
RMAN-06212: Object Type Filename/Handle
RMAN-06213: --------------- ---------------------------------------------------

The configuration of RMAN is:

RMAN> show all;
RMAN configuration parameters are:
CONFIGURE RETENTION POLICY TO RECOVERY WINDOW OF 14 DAYS;
CONFIGURE BACKUP OPTIMIZATION ON;
CONFIGURE DEFAULT DEVICE TYPE TO 'SBT_TAPE';
CONFIGURE CONTROLFILE AUTOBACKUP ON;

[code].....

How to avoid this error ? Can we set "Retention period" as 14 days in RMAN level and delete the backups in disk which is older than 7 days?Should the deletion of tape backup be handled in TSM level ?