I'm having a problem with DDT. When I add a deployment package I'm able to create a package the first time I click on create package. However if I try to create a package more than once I get the following error. It's only happening on tables that I've added manually. The security tables added via the wizard are okay.

Another issue I've run into is that DDT doesn't seem to be able to deploy tables that contain timestamp columns. It trys to insert the timestamp value and hangs.

Hrm... yes, it should be skipping the timestamp columns... or inserting NULL.  I'll check into that.

On your first problem, what steps are you taking to reproduce the problem?  You said it happens on deployment data packages that you've already added, and then you're tring to add them a second time?