Placement (group),Placement (group) url,Placement (detail),Placement (detail) url,Campaign,Ad group,Impr.,Currency code,Avg. cost,Cost,Conversions,Cost / conv.,Conv. rate,Avg. CPV,Views,View rate,Avg. CPMredacted,redacted,redacted,redacted,redacted,redacted,1,GBP,0.03,0.03,0,0,0.00%,0.03,1,100.00%,25.6redacted,redacted,redacted,redacted,redacted,redacted,1,GBP,0.01,0.01,0,0,0.00%, --,0,0.00%,5.83redacted,redacted,redacted,redacted,redacted,redacted,38,GBP,0.02,0.37,0,0,0.00%, --,0,0.00%,9.68Hi Michael,
The value '--' in reports means null. However, your concern appears to be more specific to the Google Ads UI and how values in reports are generated. With this, I would suggest that you get in touch with the product experts via the Google Ads Community Forum so they can better assist you if you have further concerns.
Regards,
Hiroyuki
Google Ads API Team