No custom attributes in rules dropdown

Hi there. When trying to create a rule for a thing asset and you then select that thing for a rule, there are no attributes available at all.
Its just an empty list. Any idea? Its the same on two different installations.

Screenshot 2022-08-02 at 9.09.05 PM

As you can see here, when you click on the attribute dropdown, it is empty.

Screenshot 2022-08-02 at 9.09.12 PM

Note that the attributes of the asset require the configuration item ‘rule state’ to be available for rules.

Thank you Pierre. That solved it.