I haven't been using ETL for long, but I keep having the same problem. When something goes wrong with the transformation script, although the ant script builds successfully, the transformation wipes out the target model. Obviously, there is a problem either with the transformation script or with the meta-models. So, I would like to know if there is a way to get some more information about the problem in order to find its root.
(If you need any more information about the problem let me know)