Add transaction "System ID" field for Trainwreck

tailbone/views/trainwreck.py

@@ -101,6 +101,7 @@ class TransactionView(MasterView):
 
     def _preconfigure_fieldset(self, fs):
         fs.system.set(renderer=forms.renderers.EnumFieldRenderer(self.enum.TRAINWRECK_SYSTEM))
+        fs.system_id.set(label="System ID")
         fs.terminal_id.set(label="Terminal")
         fs.cashier_id.set(label="Cashier ID")
         fs.customer_id.set(label="Customer ID")
@@ -113,6 +114,7 @@ class TransactionView(MasterView):
     def configure_fieldset(self, fs):
         fs.configure(include=[
             fs.system,
+            fs.system_id,
             fs.terminal_id,
             fs.receipt_number,
             fs.start_time,