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    copied!<p>Thank you, Dave, for pointing me in the right direction. One of the Date fields was nullable in the database, the other was not. I changed my class and my map to reflect that. Voila! It worked!</p> <p>Too bad the original error message didn't tell me there was an issue with a datetime field, it would've saved me some headaches.</p> <p>I made the following changes:</p> <pre><code>public class Foo { public virtual int Id { get; set; } public virtual Bar Bar{ get; set; } public virtual DateTime DateField{ get; set; } public virtual string StringField{ get; set; } public virtual Gorp Gorp{ get; set; } public virtual bool BoolField{ get; set; } public Foo() { DateField = new DateTime(1753, 1, 1); } } public class Bar { public virtual int Id { get; set; } public virtual DateTime? DateField{ get; set; } public virtual string StringField{ get; set; } public virtual ICollection&lt;Foo&gt; Foos{ get; set; } public Bar() { DateField = new DateTime(1753, 1, 1); Foos= new List&lt;Foo&gt;(); } public virtual void AddFoo(Foo foo) { foo.Bar = this; Foos.Add(foo); } } public class FooMap : ClassMap&lt;Foo&gt; { public FooMap() { Id(x =&gt; x.Id).UnsavedValue(0).GeneratedBy.Identity(); Map(x =&gt; x.DateField); Map(x =&gt; x.BoolField); Map(x =&gt; x.StringField); References(x =&gt; x.Gorp) .Column("GorpId") .Class&lt;Gorp&gt;(); References(x =&gt; x.Bar) .Column("BarId") .Not.Nullable(); } } public class BarMap : ClassMap&lt;Bar&gt; { Id(x =&gt; x.Id).UnsavedValue(0).GeneratedBy.Identity(); Map(x =&gt; x.DateField) .Nullable(); Map(x =&gt; x.StringField); HasMany&lt;Foo&gt;(x =&gt; x.Foos) .AsBag() .Cascade.SaveUpdate() .Fetch.Join() .ForeignKeyConstraintName("FK_Foo_Bar") .Inverse() .KeyColumn("BarId") .Not.KeyNullable() .Table("Foo"); } </code></pre>
 

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