LinqToDB How to use MapValueAttribute in DataParameter

Question

I have enum 'EntityStatus' with MapValue:

public enum EntityStatus
{
    [MapValue("")]
    None,
    [MapValue("AR")]
    AwaitingReview,
    [MapValue("IR")]
    InReview,
    [MapValue("RT")]
    Returned,
    [MapValue("RS")]
    Resolved,
    [MapValue("AG")]
    Agreed       
}

When I call stored procedure by

DataBase.ExecuteProc("myStoredProcedureName",
                    new DataParameter("@EntityStatus", EntityStatus.Agreed));  

I catch by a profiler call "EXEC myStoredProcedureName @EntityStatus = 5"

Me need @EntityStatus = 'AG'.

Is there a solution? How do I setup mapping by MapValue in DataParameter?