The kb_social_qa_question table isn't inherited from the task table, hence it can't be selected.
You could update the attributes on the Table field on the SLA definition form so you can select the table. Question is, however, how you are going to measure it, since the answer is going to be on the kb_social_qa_answer table.
You could use the answer count or something like that, or only when the answer is accepted? Not sure if that will help, because that's an action which is often forgotten. But it depends on what you want to see, of course.
I think just creating a metric for reporting would be better than to do this via SLA.
Please mark any helpful or correct solutions as such. That helps others find their solutions.
Mark
