Refs #340 -- Allow order changes for paid orders if they don't change the total

src/pretix/base/models/items.py

@@ -309,6 +309,10 @@ class ItemVariation(models.Model):
     def __str__(self):
         return str(self.value)
 
+    @property
+    def price(self):
+        return self.default_price if self.default_price is not None else self.item.default_price
+
     def delete(self, *args, **kwargs):
         super().delete(*args, **kwargs)
         if self.item:

src/pretix/base/models/orders.py

@@ -190,6 +190,10 @@ class Order(LoggedModel):
         """
         return '{event}-{code}'.format(event=self.event.slug.upper(), code=self.code)
 
+    @property
+    def changable(self):
+        return self.status in (Order.STATUS_PAID, Order.STATUS_PENDING)
+
     def save(self, *args, **kwargs):
         if not self.code:
             self.assign_code()