Fix update_sum left in transaction models

nummi/statement/templates/statement/forms/widgets/statement.html

@@ -7,6 +7,5 @@
       {% endif %}
     {% endfor %}
   {% endfor %}
-{% else %}
-  {% include "django/forms/widgets/select.html" %}
 {% endif %}
+{% include "django/forms/widgets/select.html" %}

nummi/transaction/forms.py

@@ -102,6 +102,7 @@ class TransactionForm(NummiForm):
 
         if _disable_statement:
             self.fields["statement"].disabled = True
+            self.fields["statement"].widget.attrs["hidden"] = True
 
 
 class InvoiceForm(NummiForm):

nummi/transaction/models.py

@@ -44,17 +44,6 @@ class Transaction(UserModel):
         verbose_name=_("Statement"),
     )
 
-    def save(self, *args, **kwargs):
-        if Transaction.objects.filter(pk=self.pk):
-            prev_self = Transaction.objects.get(pk=self.pk)
-        else:
-            prev_self = None
-        super().save(*args, **kwargs)
-        if prev_self is not None and prev_self.statement:
-            prev_self.statement.update_sum()
-        if self.statement:
-            self.statement.update_sum()
-
     def __str__(self):
         return f"{self.name}"