diff --git a/RIGS/rigboard.py b/RIGS/rigboard.py
index fc14a89e..2e2869ac 100644
--- a/RIGS/rigboard.py
+++ b/RIGS/rigboard.py
@@ -54,7 +54,7 @@ class EventOembed(generic.View):
 
     def get(self, request, pk=None):
 
-        embed_url = reverse('event_embed', args=[pk])    
+        embed_url = reverse('event_embed', args=[pk])
         full_url = "{0}://{1}{2}".format(request.scheme, request.META['HTTP_HOST'], embed_url)
 
         data = {
@@ -121,6 +121,7 @@ class EventDuplicate(EventUpdate):
         old = super(EventDuplicate, self).get_object(queryset) # Get the object (the event you're duplicating)
         new = copy.copy(old) # Make a copy of the object in memory
         new.based_on = old # Make the new event based on the old event
+        new.purchase_order = None
 
         if self.request.method in ('POST', 'PUT'): # This only happens on save (otherwise items won't display in editor)
             new.pk = None # This means a new event will be created on save, and all items will be re-created
@@ -216,4 +217,4 @@ class EventArchive(generic.ArchiveIndexView):
         if len(qs) == 0:
             messages.add_message(self.request, messages.WARNING, "No events have been found matching those criteria.")
 
-        return qs
\ No newline at end of file
+        return qs
diff --git a/RIGS/test_functional.py b/RIGS/test_functional.py
index 7e5010f7..673dadd1 100644
--- a/RIGS/test_functional.py
+++ b/RIGS/test_functional.py
@@ -438,7 +438,7 @@ class EventTest(LiveServerTestCase):
             pass
 
     def testEventDuplicate(self):
-        testEvent = models.Event.objects.create(name="TE E1", status=models.Event.PROVISIONAL, start_date=date.today() + timedelta(days=6), description="start future no end") 
+        testEvent = models.Event.objects.create(name="TE E1", status=models.Event.PROVISIONAL, start_date=date.today() + timedelta(days=6), description="start future no end", purchase_order="TESTPO") 
 
         item1 = models.EventItem(
                 event=testEvent,
@@ -498,6 +498,8 @@ class EventTest(LiveServerTestCase):
 
         infoPanel = self.browser.find_element_by_xpath('//div[contains(text(), "Event Info")]/..')
         self.assertIn("N0000%d"%testEvent.pk, infoPanel.find_element_by_xpath('//dt[text()="Based On"]/following-sibling::dd[1]').text)
+        # Check the PO hasn't carried through
+        self.assertNotIn("TESTPO", infoPanel.find_element_by_xpath('//dt[text()="PO"]/following-sibling::dd[1]').text)
 
 
 
@@ -506,6 +508,8 @@ class EventTest(LiveServerTestCase):
         #Check that based-on hasn't crept into the old event
         infoPanel = self.browser.find_element_by_xpath('//div[contains(text(), "Event Info")]/..')
         self.assertNotIn("N0000%d"%testEvent.pk, infoPanel.find_element_by_xpath('//dt[text()="Based On"]/following-sibling::dd[1]').text)        
+        # Check the PO remains on the old event
+        self.assertIn("TESTPO", infoPanel.find_element_by_xpath('//dt[text()="PO"]/following-sibling::dd[1]').text)
 
         # Check the items are as they were
         table = self.browser.find_element_by_id('item-table') # ID number is known, see above