Ivano, If I have read this correctly you wish to know if one out of the two dropdowns have had a value chosen from them so you can make sure that you are not forcing the user to choose from both dropdowns. I would make neither required fields but use event code in 'before record added' to see if the value has been changed from the original. If neither have been changed then beforeedit = false If I knew more about the fields involved I could suggest some code.