I have to simpe functions, and on button click I get exception:"object references an unsaved transient instance - save the transient instance before flushing: Accordia.DataLayer.Configuration.Workspace"

Relationship betwen AppUser and Workspace is bi_directional, cascade=all, inverse=true,...

I cant' get this DONE!
I tried with all version of lock and everithing else.
I would bee happy if some have the answer.

private AppUser GetUser(int id)
{
ISession sess = SessionManager.getSession();
if (!sess.IsConnected)
sess.Reconnect();

AppUser user = (AppUser)sess.Get(typeof(AppUser), id);
//
//
//user.workspaceId, workspaceId is a object of class Workspace and PK from table workspace is a FK in table app_user
//
sess.Close();
return user;
}
private void button1_Click(object sender, EventArgs e)
{


ISession sess = SessionManager.getSession();
if (!sess.IsConnected)
sess.Reconnect();

AppUser ent = GetUser(7);

sess.Lock(ent, LockMode.UpgradeNoWait);
ent.endDate = DateTime.Now;

try
{
sess.SaveOrUpdate(ent);
sess.Flush();
}
catch (Exception ex)
{
sess.Close();
ex = null;
}
sess.Close();

}

The problem is probably 'inverse="true"'. You've put it on the set in AppUser? inverse="true" means that this side of the relationship does NOT manage the relationship. If you will always be saving Workspaces by putting them into AppUser's collection of Workspaces, then you want inverse="false".

First of all, thanks.
You are right, but I need a parent referece and a references on all children, parts of maping files are:

Workspace: <bag name="AppUserList" inverse="true" table="app_user" lazy="true" cascade="all" >
<key column="workspace_id" />
<one-to-many class="Accordia.DataLayer.Configuration.AppUser,DataLayer" />
</bag>

AppUser: <many-to-one name="workspaceId" column="workspace_id" class="Accordia.DataLayer.Configuration.Workspace, DataLayer" />

The idea is to read user (witch have a referece to parent) in one session, than close that session, at this time user (from the code from last post) is detach, then open second session in the second session I bring that user (let say that a as a function return, like a code form last post), and that make some minor changes and THAN simply update user. This is a most common thing to do, I need that all the time, I tried with a sess.Lock(...) but it constantly saying the a workspace (parent of a user) is transistient object and that need to be saved, that is unacceptable for me.

Note: My english is not so goog, I hope that you understand what I'm trying to say.

I have found my problem, stupid litle thing :)

unsaved-value="any"