Hi Mike,

I ended up overriding mmBaseForm_Closing and using .RejectChanges() on the table I didn't want to update. Not what I would consider an elegant solution, I would much rather prefer that the business object took responsibility for which tables where to be saved, but it works all the same so now I can move on to the next challenge :)

protected override void mmBaseForm_Closing(object sender, CancelEventArgs e)
{
DataSet ds = oPrimBizObj.GetCurrentDataSet();
DataTable nonMembers = ds.Tables[oPrimBizObj.NonMembersTable];
nonMembers.RejectChanges();
base.mmBaseForm_Closing(sender, e);
}

Thanks for your help,

Andrew