For sources that are not part of a repository, the repository name from the previously viewed source that is part of the repository is displayed in the Repositary Tab. This happens when editing a source selected from the entity table for sources. Trying to delete the repository has no effect (Delete repository null message). The repository is not saved when confirmig other changes in the source record, which is OK. Still it is annoying.
I use Ancestris 13.
Best regards,
Matjaž