The given key was not present in the dictionary - clicking on shipments tab of SOOrderEntry

​@Django Here is the code that fixed that issue… thanks for reminding me to post it as a blog post linking it to the other threads!

using PX.Data;
using PX.Objects.PO;
using PX.Objects.SO;
using System;
using System.Reflection;

namespace HaunWelding.Delivery
{
    [PXProtectedAccess]
    //you need to put this attribute on, or it will show the display name as Cst_ on the grid
    [PXUIField(DisplayName = "Status", Enabled = false)]
    //abstract due to having abstract due to PXProtectedAccess
    public abstract class SOOrderShipmentStatusAttachedToExt : PXGraphExtension<PX.Objects.SO.GraphExtensions.SOOrderEntryExt.Status, SOOrderEntry>
    {
        #region ProtectedAccess
        [PXProtectedAccess(typeof(PX.Objects.SO.GraphExtensions.SOOrderEntryExt.Status))]
        protected abstract PXFieldState DefaultState(PXCache sender, PXFieldSelectingEventArgs e);
        [PXProtectedAccess(typeof(PX.Objects.SO.GraphExtensions.SOOrderEntryExt.Status))]
        protected abstract PXFieldState AdjustByAttribute(PXFieldState state, PXUIFieldAttribute uiAttribute);
        [PXProtectedAccess(typeof(PX.Objects.SO.GraphExtensions.SOOrderEntryExt.Status))]
        protected abstract PXFieldState AdjustStateBySelf(PXFieldState state);
        [PXProtectedAccess(typeof(PX.Objects.SO.GraphExtensions.SOOrderEntryExt.Status))]
        protected abstract PXFieldState AdjustStateByRow(PXFieldState state, SOOrderShipment row);
        #endregion


        //these properties are getters only, no need to protected access.
        protected PXUIFieldAttribute FieldAttribute => GetType().GetCustomAttribute<PXUIFieldAttribute>();
        protected virtual bool SuppressValueSetting => false;
        protected virtual String ValueForEmptyRow => default(String);

        public override void Initialize()
        {
            // base method initialize code that we will not call, as I can't get it to remove that event with a proper signature
            /*  FieldName = GetType().Name.LastSegment('+');
                base.Base.Caches<TTable>().Fields.Add(FieldName);
                base.Base.FieldSelecting.AddHandler(typeof(TTable), FieldName, FieldSelecting);*/

            //do not call initialize
            //base.Initialize();

            //call code from the base method that we need
            Base.Caches<SOOrderShipment>().Fields.Add("Status");
            base.Base.FieldSelecting.AddHandler(typeof(SOOrderShipment), "Status", FieldSelecting);
        }

        //copy of field selecting
        public virtual void FieldSelecting(PXCache sender, PXFieldSelectingEventArgs e)
        {
            PXFieldState state = DefaultState(sender, e);
            if (FieldAttribute != null)
            {
                state = AdjustByAttribute(state, FieldAttribute);
            }

            state = AdjustStateBySelf(state);
            state = AdjustStateByRow(state, (SOOrderShipment)e.Row);
            e.ReturnState = state;

            if (!SuppressValueSetting)
            {
                e.ReturnValue = ((e.Row == null) ? ValueForEmptyRow : GetValue((SOOrderShipment)e.Row, sender));
            }
        }
        //copy the base function for GetValue, as I cannot PXOverride it. 
        public virtual string GetValue(SOOrderShipment row, PXCache sender)
        {
            if (row.ShipmentType == SOShipmentType.DropShip)
            {
                using var receipt = PXDatabase.SelectSingle<POReceipt>(new PXDataField<POReceipt.status>(),
                    new PXDataFieldValue<POReceipt.receiptType>(PXDbType.Char, null,
                        row.Operation == SOOperation.Issue ? POReceiptType.POReceipt : POReceiptType.POReturn, PXComp.EQ),
                    new PXDataFieldValue<POReceipt.receiptNbr>(PXDbType.NVarChar, null, row.ShipmentNbr, PXComp.EQ));
                if (receipt == null)
                {
                    return null;
                }
                return (new POReceiptStatus.ListAttribute()).ValueLabelDic[receipt.GetString(0)];
            }
            else
            {
                using (new PXReadThroughArchivedScope())
                {
                    using var shipment = PXDatabase.SelectSingle<SOShipment>(new PXDataField<SOShipment.status>(),
                        new PXDataFieldValue<SOShipment.shipmentType>(PXDbType.Char, null, row.ShipmentType, PXComp.EQ),
                        new PXDataFieldValue<SOShipment.shipmentNbr>(PXDbType.NVarChar, null, row.ShipmentNbr, PXComp.EQ));
                    if (shipment != null)
                    {
                        //changed to use my new list attribute
                        return (new SOShipmentStatusExt.ListAttribute()).ValueLabelDic[shipment.GetString(0)];
                    }
                    else
                    {
                        return PXMessages.LocalizeNoPrefix(PX.Objects.SO.Messages.AutoGenerated);
                    }
                }
            }
        }
    }
}