On my form the User needs to input a new Job_Reference (typically something like SMI09_1) where the SMI is the client code, 09 the year and the _1 the reference number for that year. As the user can't necessariy know the clients last reference number I want the form to show a message if a similar Job_Reference exists (primary key) so a new number can be inputted. (As the job_reference is the PK Microsoft displays its default message but I want to put something more user friendly there). Ideally I would also like to show any records that are similar to that clients code. Any suggestions please?