in NHibernate, i invoke delete but update is invoked automatically!! i use FluentNhibernate Automapping.
                +1 
                A: 
                
                
              
            Check that each of your fields are mapped as NULLable as required. I've had a similar problem when I've forgotten to mark a field that is NULLable as NULLable in my mapping.
                  Tahbaza
                   2010-09-30 12:03:15