Why i cant add this column [tabSales Invoice Item.posa_is_offer] as a filter on Frappe Insights? its keep disappear

Thanks
Why i cant add this column [tabSales Invoice Item.posa_is_offer] as a filter on Frappe Insights? its keep disappear

Thanks
anyone, please�
Try this: Instead of selecting, type the entire thing out and then save. Seems like a bug, but this hack works at times.
Thanks @michelle.