unable to delete alias

[defaultuserfoo]

Hi,

how do I get rid of an unused firewall alias that appears as still being referenced and can not be deleted?

When I try to delete it, I'm getting an info that a rule is still using it, but I deleted the rule and then deleted the whole interface the rule was used with.  There is no way that this alias should still be used in any way.

So far, I was only to disable the alias.  It's for a host and contains an IPv4 address.