MapInfo Pro

Thanks to you too Peter, much appreciated. If only our IT service desk was as responsive as the forum! Cheers Chris ------------------------------ Chris Dickinson North Yorkshire County Council ------------------------------

Excellent! Thanks very much James Chris ------------------------------ Chris Dickinson North Yorkshire County Council ------------------------------

James, Your solution added the trick that made it work: joining the table before running the update. I tried it myself and ran into issues. I couldn't refer back to a column in the point table when building the expression used to update that column. ...