Copy SOOrder custom value into ARInvoice custom field

Trying to override InvoiceOrder and InvoiceCreated on SOInvoiceEntry to copy a value from source SO to invoice.  The client could create invoices from order entry or shipment so I want to make sure it gets copied no matter what so therefore trying to do this without overriding PrepareInvoice action.

This is what I have so far on SOInvoiceEntry graph extension:

        public delegate void InvoiceOrderDelegate(InvoiceOrderArgs args);

        [PXOverride]
        public virtual void InvoiceOrder(InvoiceOrderArgs args)
        {
            //Code before
            Base.InvoiceOrder(args);
            //Code after

            InvoiceCreated(Base.Document.Current, args);
        }

        [PXOverride]
        public virtual void InvoiceCreated(ARInvoice invoice, InvoiceOrderArgs args)
        {
            // Base.InvoiceCreated(invoice, args);
            ARRegisterExt registerExt = PXCache<ARRegister>.GetExtension<ARRegisterExt>(invoice);
            SOOrderExt orderExt = PXCache<SOOrder>.GetExtension<SOOrderExt>(args.SOOrder);

            registerExt.UsrLumpSumReport = orderExt.UsrLumpSumReport;
        }

However, I get an error : 'AR Transactions' cannot be found in the system. and I don’t know what this means.  I think it’s happening on the Base.InvoiceOrder(args) line.

Here is my stack trace:

   at PX.Objects.SO.SOInvoiceEntry.ValidateLinesAdded(Boolean lineAdded)
   at PX.Objects.SO.SOInvoiceEntry.InvoiceOrderImpl(InvoiceOrderArgs args)
   at PX.Objects.SO.SOInvoiceEntry.InvoiceOrder(InvoiceOrderArgs args)
   at Wrapper.PX.Objects.SO.Cst_SOInvoiceEntry.InvoiceOrderGeneratedWrapper(SOInvoiceEntry g, InvoiceOrderArgs )
   at PX.Objects.SO.SOInvoiceEntry_Extension.InvoiceOrder(InvoiceOrderArgs args) in C:\inetpub\wwwroot\AcumaticaDLB\App_Data\Projects\AME[MatrixCosts]\AME[MatrixCosts]\SOInvoiceEntry.cs:line 61
   at PX.Objects.SO.SOOrderEntry.InvoiceOrder(Dictionary`2 parameters, IEnumerable`1 list, InvoiceList created, Boolean isMassProcess, ActionFlow quickProcessFlow, Boolean groupByCustomerOrderNumber)
   at PX.Objects.SO.SOOrderEntry.InvoiceOrders(List`1 list, Dictionary`2 arguments, Boolean massProcess, ActionFlow quickProcessFlow)
   at PX.Objects.SO.GraphExtensions.SOOrderEntryExt.Blanket.InvoiceOrders(List`1 list, Dictionary`2 arguments, Boolean massProcess, ActionFlow quickProcessFlow, Action`4 baseMethod)
   at Wrapper.PX.Objects.SO.Cst_SOOrderEntry.InvoiceOrdersGeneratedWrapper(SOOrderEntry g, List`1 , Dictionary`2 , Boolean , ActionFlow )
   at PX.Objects.SO.SOOrderEntry.<>c__DisplayClass137_0.<PrepareInvoice>b__0()
   at PX.Concurrency.CancellationIgnorantExtensions.RunWithCancellationViaThreadAbort(Action method, CancellationToken cancellationToken) in C:\build\code_repo\NetTools\PX.Data\Concurrency\CancellationIgnorantExtensions.cs:line 16
   at PX.Concurrency.CancellationIgnorantExtensions.<>c__DisplayClass1_0.<ToCancellationViaThreadAbort>b__0(CancellationToken cancellationToken) in C:\build\code_repo\NetTools\PX.Data\Concurrency\CancellationIgnorantExtensions.cs:line 23
   at PX.Concurrency.Internal.PXLongOperationPars.PopAndRunDelegate(CancellationToken cancellationToken) in C:\build\code_repo\NetTools\PX.Data\Concurrency\Internal\PXLongOperationPars.cs:line 105
   at PX.Concurrency.Internal.RuntimeLongOperationManager.PerformOperation(PXLongOperationPars p) in C:\build\code_repo\NetTools\PX.Data\Concurrency\Internal\RuntimeLongOperationManager.cs:line 159