Custom Code Decommissioning "Delete Transport" not working

Hello,

I am working on Custom Code Decommissioning on SP12.

I have created a new analysis and get the object list.

Then I tried to backup transport one object before deleting the transport.

Once backed up, the object status changed to "Backed up".

Then I click on "delete transport" and I get the following error message:

I already have backed up my object as it is saved in a transport (transport of copies). I also tried to release the transport of copy and then click again on "delete transport" but same message appears.

I would like to back up my object in a transports and then being able to decommission/delete this object.

Do you have any ideas or tips on how I can do that?

Thanks for your help!

L. Bariohay