My question concerns a new O9 CE Installation where I made some changes in the Chart of Accounts for putting the right accounts our tax consultant is in need for.

Everything went fine, but only one account denies to be deleted. :-(

And it has a really strange behavior:
Yesterday a warning message told, that it is not possible to delete/deactivate an account, which is set on an customer or vendor, but today the message don´t appear and nothing happens after my click with delete selection.

I can copy the account and delete the new copied account without problems.

None of the contacts is related to the mentioned "undeletable" account.Any ideas where to search?