I have a combobox that filters my records for a form. I would like to add an After_Update Event that analyzes the results of the returned records, and puts up a MsgBox warning the user if there are duplicates. There are 2 fields that must have duplicate information in order for the record to be considered a duplicate. They are qry_Invoice_Detail_AllClaims. [Invoice Number] and qry_Invoice_Detail_AllClaims.[Amount Invoiced]. Any ideas on how to approach this?