Evidence: [6000 item(s)] OPEN <sharepoint-url> Probe Threshold/Threshold EDTNEG.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 6 <FieldRef>, which is 6 editor row(s) by the count _views.py uses. The filter is <Where><And><And><Or><IsNull><FieldRef Name="Bucket"/></IsNull><Neq><FieldRef Name="Bucket"/><Value Type="Text">A</Value></Neq></Or><Or><IsNull><FieldRef Name="Bucket"/></IsNull><Neq><FieldRef Name="Bucket"/><Value Type="Text">B</Value></Neq></Or></And><Or><IsNull><FieldRef Name="Bucket"/></IsNull><Neq><FieldRef Name="Bucket"/><Value Type="Text">C</Value></Neq></Or></And></Where>