Filter on empty Primary Linked Item Name when reporting in Events
When generating reports based on Events, my report contains Event records that have a blank Primary Linked Item Name (and blank Primary Linked Item Type).
However, when I try to add a filter of 'Primary Linked Item Name' and a filter of 'is empty' (to only report on Events with blank values of 'Primary Linked Item Name') no records show on the resulting report. Is there any way of filtering on 'Primary Linked Item Name' to only see records with blank values ?
PS - this also happens when trying to filter on 'Primary Linked Item Type'.