Noticed that when you add a criteria sig that uses decimals it creates them as nullable which is fine, good in fact for me

        protected class Criteria
        {
            public string SomeCode;
            public Nullable<System.Decimal> SomeId1;
            public Nullable<System.Decimal> SomeId2;

            //-----------------------------------------------------------------            
            public Criteria()
            {
            }        
        }

But the return function that passes in the criteria doesn't use nullable values so you can't actually pass a null in

public static SomeList GetSomeListByCriteria(string someCode, System.Decimal someId1, System.Decimal someId2)