In the automate actions filters, I choose the MySQL Query field for that function and have it set to include 0. The purpose is to not show the void button if a user is assigned to any tasks. If there are no assigned users, have it show the button to allow voiding.
When I add the filter mentioned above, it will cause a database error on the parents item page.
Database Error: 1054 - Unknown column 'field_848' in 'having clause'
Query: select e.id from app_entity_48 e where e.id=10 having ((field_848=0))
Page: /index.php?module=items/info&path=48-10