Add vendor remit to AP301000

Just got back to this and wasn’t too difficult.  Just added a new field and fill on RowSelected in APInvoiceEntry graph extension.

        protected void APInvoice_RowSelected(PXCache cache, PXRowSelectedEventArgs e)
        {
            APInvoice row = e.Row as APInvoice;
            if (row != null)
            {
                APInvoiceExtension rowExt = PXCache<APInvoice>.GetExtension<APInvoiceExtension>(row);
                var vendor = Base.vendor.Current;

                if (vendor != null)
                {
                    // Fetch the Address record using the DefAddressID from the Vendor
                    var addressResult = PXSelect<Address,
                        Where<Address.addressID, Equal<Required<Address.addressID>>>>
                        .Select(Base, vendor.DefAddressID).FirstOrDefault();

                    var address = (Address)addressResult;

                    if (address != null)
                    {
                        string fullAddress = "";
                        if (!string.IsNullOrEmpty(address.AddressLine2))
                        {
                            fullAddress = $"{address.AddressLine1 ?? ""}\r\n" +
                                $"{address.AddressLine2}\r\n" +
                                $"{address.City ?? ""}, {address.State ?? ""}  {address.PostalCode ?? ""}";
                        } else {
                            fullAddress = $"{address.AddressLine1 ?? ""}\r\n" +
                                $"{address.City ?? ""}, {address.State ?? ""}  {address.PostalCode ?? ""}";
                        }

                        rowExt.UsrVendorContactAddress = fullAddress;
                    }
                    else
                    {
                        rowExt.UsrVendorContactAddress = null;
                    }

                }
                else
                {
                    rowExt.UsrVendorContactAddress = null;
                }
            }
        }