Evidence: [6000 item(s)] OPEN <sharepoint-url> Probe Threshold/Threshold EDTPLN.aspx, then Settings > Edit current view, and report ONE of: the NUMBER of filter rows the editor shows, or "refused" (it would not open the filter at all). 3 clause(s) here render 3 <FieldRef>, which is 3 editor row(s) by the count _views.py uses. The filter is <Where><And><And><Eq><FieldRef Name="Bucket"/><Value Type="Text">A</Value></Eq><Eq><FieldRef Name="Bucket"/><Value Type="Text">B</Value></Eq></And><Eq><FieldRef Name="Bucket"/><Value Type="Text">C</Value></Eq></And></Where>