SO Line Inventory ID Cache Attached Issue

Hi, 

I am trying to customize or filter the Inventory ID Lookup on the Sales Order Screen (SO30100) by using SOLine_InventoryID_CacheAttached. Whenever I select the item, the grid line is filled up with the internal inventory ID value instead of the inventory CD.

 Here is my code

public class SOOrderEntry_Extension : PXGraphExtension<PX.Objects.SO.SOOrderEntry>
    {


        [PXMergeAttributes(Method = MergeMethod.Append)]
        [InventorySelectorCustom(typeof(InventoryItem.inventoryCD))]
        protected virtual void SOLine_InventoryID_CacheAttached(PXCache cache)
        {
        }


        [Serializable]
        public class InventorySelectorCustom : PXCustomSelectorAttribute
        {
            public InventorySelectorCustom(Type type)
                : base(type,   typeof(InventoryItem.inventoryCD),typeof(InventoryItem.descr)
                      , typeof(InventoryItem.itemClassID), typeof(InventoryItem.itemStatus), typeof(InventoryItem.itemType)
                      , typeof(InventoryItem.baseUnit), typeof(InventoryItem.salesUnit), typeof(InventoryItem.purchaseUnit)
                      , typeof(InventoryItem.basePrice), typeof(InventoryItem.exportToExternal))
            {
            }
            public virtual IEnumerable GetRecords()
            {
                SOLine currentItem = (SOLine)this._Graph.Views["Transactions"].Cache.Current;
                if (currentItem == null)
                {
                    return null;
                }
                else
                {

                    SOOrder currentOrder = (SOOrder)this._Graph.Views["Document"].Cache.Current;

                    List<InventoryItem> items = new List<InventoryItem>();
                    var allitems = PXSelect<InventoryItem>.Select(this._Graph);
                    foreach (var it in allitems)
                    {
                        InventoryItem rec = (InventoryItem)it[0];
                        items.Add(rec);
                    }
                    return items;
                }
            }
        }
    }