var results = this.Session.CreateSQLQuery("EXEC qa.AdjustDates @VpGuarantorId =:VpGuarantorId, @DatePart =:DatePart, @Adjustment =:Adjustment")
            .AddScalar("IssueLevel", NHibernateUtil.String)
            .AddScalar("IssueMessage", NHibernateUtil.String)
            .SetParameter("VpGuarantorId", guarantorId)
            .SetParameter("DatePart", datePart)
            .SetParameter("Adjustment", adjustment)
            .SetResultTransformer(new AliasToBeanResultTransformer(typeof (IssueResult)))
            .List<IssueResult>()
            .ToList();

public class IssueResult
{
    public virtual string IssueLevel { get; set; }
    public virtual string IssueMessage { get; set; }
}