If you want to add a third table, add it, set a prefix for it, put the order 300 and the add a similar condition like the one that was set for the hr case:
sla_task = new_table_prefix_sys_id
Hope this helps!
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try to change the "Left join" checkbox on the three records related with the three tables. I know that it will interfere with the results, so this might be the case!!
