ISNULL() will work just for range info type fields, if we don’t populate with worth for quantity fields it can return real. It received’t aid Textual content data kind fields simply because textual content fields hardly ever turn into null. Customized Validations and yet again system validation regulations will hearth (Site http://elliotjfzmb.blogzet.com/5-easy-facts-about-get-help-for-solidworks-assignment-described-15175262