Here is a use case:
As a customer, I want to be able to create a Ticket in the JSM Portal, and select an object from a list of objects which were not linked to a similar request before.

I would like to use the following IQL:
Filter Issue Scope:

object NOT HAVING connectedTickets("Customer Request Type" = ${customfield_10106})

While I can use this IQL in an IQL Postfunction, I cannot use it in the Filter Issue Scope