Hard one to know without actually testing it and seeing if I think.
But the great thing about the query editor is you can just play around and you won’t break anything. Have you tried a few things to see if they fix it?
Did you jump back into a previous transformation and attempt to change it?
Thanks for the reply. I tried deleting a row in the advanced editor code but still gave me an error. I then decided to click on wheel(?) next to line in applied steps (image below) and that provided the list of columns to keep (which was the step in advanced editor). So I checked the Inv Price field and everything worked out fine from there. BI and Query Editor are so versatile compared to doing in Excel !! Thanks again.