Yeah so filter isn’t going to work with this method. The refresh builds a filter string using your added column name but that column doesn’t exist in the method being called so you get an error. You could try adding the column using the BPM method like so: PO Suggestions: Adding fields into landing page
but i believe the same problem remains. AFAIK, there’s no solution to this problem or if I’ve seen one on here I forget. So IIRC, there’s no good way to add columns to existing landingpage grids and keep the grid functional.
It’d be nice if it fell back to client-side filtering in this case. YOu might be able to strip that column from the filter on a pre-process bpm, but that’s not my strong suit(?)