SymptomsEven though I am operating under a user with an "Administrator" role in the control panel, I cannot remove a subdomain.
ResolutionThe problem will be fixed in a future product version for which a new Knowledge Base article will be created. You may subscribe to new articles on Parallels Plesk Panel products if you wish to receive notifications about their creation.
Workaround1. Back up these two files:
2. Download this fix_for_10.4.zip archive.
3. Unzip it.
4. Move the two enclosed files to the same locations as shown above.