Update invoice form

nummi/main/templates/main/form/invoice.html

@@ -13,11 +13,16 @@
           type="text/css" />
 {% endblock %}
 {% block body %}
-    <h1>{{ form.instance }}</h1>
+    {% with invoice=form.instance %}
+        <h1>{{ invoice }}</h1>
+        <p>
+            <a href="{{ invoice.transaction.get_absolute_url }}">{{ invoice.transaction }}</a>
+        </p>
         {% spaceless %}
             <form id="transaction" method="post" enctype="multipart/form-data">
                 {% csrf_token %}
                 {{ form }}
             </form>
         {% endspaceless %}
+    {% endwith %}
 {% endblock %}