How to enable LotserialNbr on a line-item grid in a custom form with a custom DAC?

Hello Community, 

I am working on a custom transactional screen that will essentially act like inventory adjustments with a bit more info attached\tracked and allow for continuous updates to the record to create actual receipts\issues from. To accomplish this, I created a custom header and detail table, attempting to bypass the usual line-item table and then line-item split table I’ve seen and going straight to the “splits” table. I have most of everything working except the ability to get the LotSerialNbr column unlocked. Has anyone ran into issues getting the LotSerialNbr enabled on the line-item grid level? Below is my current DAC definition for this field. 

        #region LotSerialNbr
        public abstract class lotSerialNbr : PX.Data.BQL.BqlString.Field<lotSerialNbr> { }
        protected String _LotSerialNbr;
        [POLotSerialNbr(typeof(inventoryID), typeof(subItemID), typeof(locationID), typeof(lotSerialNbr), typeof(NXINPallets.costCenterID))]
        public virtual String LotSerialNbr
        {
            get
            {
                return this._LotSerialNbr;
            }
            set
            {
                this._LotSerialNbr = value;
            }
        }
        #endregion

Then the PK and FK entries for this DAC:

  public class NXINPalletsSplit : PXBqlTable, IBqlTable, ILSDetail
    {
        public class PK : PrimaryKeyOf<NXINPalletsSplit>.By<palletNo, lineNbr, splitLineNbr>
        {
            public static NXINPalletsSplit Find(PXGraph graph, string palletNo, int? lineNbr, int? splitLineNbr, PKFindOptions options = PKFindOptions.None)
                => FindBy(graph, palletNo, lineNbr, splitLineNbr, options);
        }
        public static class FK
        {
            public class Receipt : NXINPallets.PK.ForeignKeyOf<NXINPalletsSplit>.By<palletNo> { }
            public class Branch : PX.Objects.GL.Branch.PK.ForeignKeyOf<NXINPalletsSplit>.By<branchID> { }
            public class LotSerialStatus : INLotSerialStatus.PK.ForeignKeyOf<NXINPalletsSplit>.By<inventoryID, subItemID, siteID, locationID, lotSerialNbr> { }
            public class LocationStatus : INLocationStatus.PK.ForeignKeyOf<NXINPalletsSplit>.By<inventoryID, subItemID, siteID, locationID> { }
            public class SiteStatus : INSiteStatus.PK.ForeignKeyOf<NXINPalletsSplit>.By<inventoryID, subItemID, siteID> { }
            public class InventoryItem : PX.Objects.IN.InventoryItem.PK.ForeignKeyOf<NXINPalletsSplit>.By<inventoryID> { }
            public class Site : INSite.PK.ForeignKeyOf<NXINPalletsSplit>.By<siteID> { }
            public class SubItem : INSubItem.PK.ForeignKeyOf<NXINPalletsSplit>.By<subItemID> { }
            public class Location : INLocation.PK.ForeignKeyOf<NXINPalletsSplit>.By<locationID> { }
        }

Any help or direction would be awesome, thanks in advance!