Illegal attempt to associate a collection with two open sessions

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Hello all,
new to the list, hope I'll be able to contribute as well :)
Before I begin, here's a bit of background: I'm working on a library
cataloguing application using NHibernate + Spring.Net strictly for
educational reasons...

The exception I've mentioned is thrown whenever attempting to do a
session.SaveOrUpdate() on an object (library Item) containing a many-to-many
property (IList<LibTransaction> Transactions). The mapping (using
NHibernate.Mapping.Attributes) looks like this:

[Bag(0, Access = "property", Lazy = true, Inverse = true, Name =
"Transactions", Table = "ItemTransaction")]
[Key(1, Column = "ItemID")]
[ManyToMany(2, ClassType = typeof(LibTransaction), Column =
"TransactionID")]
public virtual IList<LibTransaction> Transactions
{
    get { return transactions; }
    set { transactions = value; }
}

The exception is also thrown whenever attempting
IPersistentCollection.SetCurrentSession() with the above mentioned property.

I would be grateful for any idea or response!

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Hello all,<br>new to the list, hope I&#39;ll be able to contribute as well :)<br>Before I begin, here&#39;s a bit of background: I&#39;m working on a library cataloguing application using NHibernate + Spring.Net strictly for educational reasons...<br>
<br>The exception I&#39;ve mentioned is thrown whenever attempting to do a session.SaveOrUpdate() on an object (library Item) containing a many-to-many property (IList&lt;LibTransaction&gt; Transactions). The mapping (using NHibernate.Mapping.Attributes) looks like this:<br>
<br>[Bag(0, Access = &quot;property&quot;, Lazy = true, Inverse = true, Name = &quot;Transactions&quot;, Table = &quot;ItemTransaction&quot;)]<br>[Key(1, Column = &quot;ItemID&quot;)]<br>[ManyToMany(2, ClassType = typeof(LibTransaction), Column = &quot;TransactionID&quot;)]<br>
public virtual IList&lt;LibTransaction&gt; Transactions<br>{<br>&nbsp;&nbsp;&nbsp; get { return transactions; }<br>&nbsp;&nbsp;&nbsp; set { transactions = value; }<br>}<br><br>The exception is also thrown whenever attempting IPersistentCollection.SetCurrentSession() with the above mentioned property.<br>
<br>I would be grateful for any idea or response!<br>

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