Moin, FYI katie has been changed to check source versions just like it already does for binary versions, i.e. every source upload must have a newer version than the ones currently in the target suite(s).
This had to be done since jenna does removals based on version numbers and if someone (say, doko@ ;-) uploaded a source package with an older version than previously existed, it would be auto-deleted in favour of the existent older-but-newer-by-version package. I don't anticipate it causing you any problems (now that you're aware of it) since source versions can be epoched (see gawk, for example) but if there are any problems, give me a shout. -- James