Cannot delete last Deployment Type as it is referenced by a previously deleted Deployment Type

Hi guys...

I have previously created dependencies between two (2) separate Application's Deployment Types (DT) as such:

"DT_A in Application_A" depends on "DT_B in Application_B"

During some test procedures, we have deleted the whole of Application_A (along with all its DTs).

Now, we are unable to delete DT_B as well as it complains that it is still being referenced by (the already deleted)DT_A. Obviously we can't delete Application_B as a whole as it is still complaining thatDT_B is still being referenced.

1. The References tab in Application_B still shows that it is still being referenced by Application_A even though searching from the Console as well as Get-CMApplication does not show any more of the deletedApplication_A
2. The last and only Revision inApplication_B's Revision History cannot be deleted as its Delete button is greyed out.
3. However, the View button can be clicked and it shows the historical revision during the time when Application_A still referenced Application_B.

Any ideas on how we can delete Application_B ? Is deleting Applications and DTs via SQL Query possible ?