[To Location No]

Hello, around 2 weeks ago my companies users started experiencing an issue we never ran into prior. All the way down at the end of the columns there is a “Location No” column. We’ve never touched this before and had no issues prior. Recently when we go to a new line it runs an error of “To Location No” not filled. We have to manually type 0 to bypass it which is incredibly annoying for our users to do on every single line. What could the cause of this be? Thanks. PS we’re on apps10.