Calling Jodie! Need your TSM expertise again. Can you compare your settings with mine?

I'm running into a situation where my backups never get physically deleted/purged from TDP. They simply continue to sit in an "INACTIVE_VERSION" state in TSM for ever.

When I issue a "delete backup" from RMAN,
1) the "STATE" column in the TSM table "backups" changes from "ACTIVE_VERSION" to "INACTIVE_VERSION"
(Do a select * from backups where node_name='YOUR_NODE_NAME'; )

AND

2) The "deactive_date" column in the "backups" table changes from blanks to "1900-01-01"! (What's 1900-01-01? Why doesn't it plug the correct date?)

My management class settings are as follows :
Verexists=9 (I also tried setting it to 1)
Verdel=0
Retextra=0
Retonly=0

(What are yours set to?)

Per TDP documentation, the above settings ought to take care of changing the state from "INACTIVE_VERSION" to "EXPIRED". (But that doesn't happen in my case).

And then when the "expire inventory" command is run by the TSM admin, TSM ought to purge the object from the TSM database and free up the storage space where the backup object resided.

Aargh..I can't seem to get TSM to expire these INACTIVE backups.