Ptable created -> Associted with OS
Host created -> Associated with OS (associated with the ptable indirectly)

Ptable removed from the OS, but still remained to be associated with the OS)

Unable to remove the ptable because it is still associated with the OS.
Under the host -> operating system -> Partition table is blank with error (Ptable is not associated with the OS)
Select "unmanage host"
operating system field completely removed, but yet
SELECT "hosts.ptable_id" from "hosts" where name = 'name of host';
returned 11, which is the ptable i created. Had to manually update hosts set ptable_id = NULL where name = 'name of host'; to be able to then remove the ptable.

Version is 1.1stable, yet i am not sure if this is in 1.2.2 or not, couldn't find a bug fix for it in any of the issue lists or it mentioned, but possible it is fixed already and i overlooked.