OQL List Tickets without CIs or CIs without Application Solution

[TheBigOne]

Hi,

I cannot find a solution within OQL to find UserRequest or other tickets where no CIs are attached.
There is a field in the class namen functioncis_list or applicationsolutions_list but I found no way in OQL to do something like: SELECT UserRequest WHERE functioncis_list ISNULL or = NULL
I could select the lnkFunctionalCIToTicket but in this case I find only tickets with CIs attached :(

Id like to create an audit rule for that and I cant use arrays or php for that.
In the Datamodel there is mentioned "Array of objects" but I don`t know how to access it. I could also find nothing helpful in the OQL_Reference of Combodo.

Could someone please give me a hint how to solve it?

Thanks in advance