I have an order entry form where the user needs to select the customer name from a lookup list. If the customer has not been set up in SharePoint I have added "NO Customer Listed" to the lookup list. If the user selects "No Customer Listed" I want to inform the user to contact the credit department and not allow the form to submit. I have tried using validation formula as in the screen shot, and this isn't working. Any help or advise would be appreciated as I am very new in learning Nintex.