Labor Item Selection Based on Earning Type

Hi Team,

I want to display only values in the labor item field selector where the earning type is selected as 'BILLABLE' on the summary tab of the 'Employee Time Card' screen. I have written the code for this, but it's not working. Kindly provide me with a solution so that I can achieve this.

 #region LabourItemID  
        public new abstract class labourItemID : PX.Data.BQL.BqlInt.Field<labourItemID> { }
        [PMLaborItem(typeof(projectID), typeof(earningType), typeof(Select<EPEmployee, Where<EPEmployee.bAccountID,
            Equal<Null>>>))]
        [PXSelector(typeof(Search<InventoryItem.inventoryID, Where<InventoryItem.itemClassID,
                    In2<Search<INItemClass.itemClassID, Where
                           <INItemClass.itemClassCD, Equal<Current<EPTimeCardSummaryWithInfo.earningType>>>>>,
                            And<CustomerClassAttr.EarningType, Equal<Current<EPTimeCardSummaryWithInfo.earningType>>>>>),
                            SubstituteKey = typeof(InventoryItem.inventoryCD),
                          DescriptionField = typeof(InventoryItem.descr)
            )]
        [PXCustomizeSelectorColumns(
            typeof(PX.Objects.IN.InventoryItem.inventoryCD),
            typeof(PX.Objects.IN.InventoryItem.descr),
            typeof(PX.Objects.IN.InventoryItem.itemClassID),
            typeof(PX.Objects.IN.InventoryItem.itemStatus),
            typeof(PX.Objects.IN.InventoryItem.itemType),
            typeof(PX.Objects.IN.InventoryItem.baseUnit),
            typeof(PX.Objects.IN.InventoryItem.salesUnit),
            typeof(PX.Objects.IN.InventoryItem.purchaseUnit),
            typeof(PX.Objects.IN.InventoryItem.basePrice))]
        public int? LabourItemID { get; set; }

        public class CustomerClassAttr
        {
            public class EarningType : BqlType<IBqlString, string>.Constant<EarningType>
            {
                public EarningType() : base("BILLABLE") { }
            }
        }
        #endregion
    }
}

Regards,

Sagar