What version of DevForce are you using ("Classic", DF 2009, DF2010)? What client technology are you using (Windows Forms, WPF, Silverlight)?
I ask because all of the terminology you use - BindingSource, MVP, verification - these terms would have been in common use several years ago. There is no "BindingSource" in WPF or Silverlight for example. I realize that some of our documentation still refers to the BindingSource and may have caused some confusion.