You will need to be more specific. What version of PB? What DBMS are you using? Without the answer to those questions, I can at least tell you this much: This error usually indicates that another user has retrieved one or more of the same table rows that you have retrieved. The other user has then updated and saved one or more of those records to the database, while you have had your records "displayed" in your datawindow. To prevent you from overwriting the changes that the other user has already made. The DBMS tells you that "hey! some one had already changed one (or more) of these rows. You're going to have to retrieve them again and reapply your changes before you can save them." (otherwise I will be saving "dirty data" to the database.