Yes, unfortunately i cannot modify existing load statement with few temporary options (as I usually do in IQ) and for me it seems that IQ cannot handle null values, which is very strange. I will modify existing query by replacing null vales with text char, but must admit that this is not correct, because in IBM Clementine we can easily work with null values.
Also, if I change Object name in the Universe (because SAP Predictive Analysis can handle only non space object names) then usually I need to drag it once again from the Universe folder catalog, because by default object is gone and not updated with it's new name.