Can ATP be used for service items -- non stockable -- non trasactable. I am getting error scheduling

Should ATP be used for service items >> Stockable = Not checked , Transactable = Not checked, customer ordered = Checked , Customer ordered enabled = Checked, Shippable = Not checked, OE_transactable = Checked

I am getting error scheduling failed ATP processing error  and item is  check ATP ''Material Only'' ATP rule and component ''None''

Kindly suggest