-<td><input name="effort_date" size=10 value="{{date}}"></td>
-<td><input type="number" name="effort" step=0.1 size=8 value="{{effort}}" placeholder="{{todo.default_effort}}" /></td>
-<td><input type="checkbox" name="delete_effort" value="{{date}}" />
+<td><input name="effort_date" size=10 value="{{date}}" {% if todo.children and effort %}disabled{% endif %}></td>
+<td><input type="number" name="effort" step=0.1 size=8 value="{{effort}}" placeholder="{{todo.default_effort}}" {% if todo.children and effort %}disabled{% endif %} /></td>
+<td>{% if not (todo.children and effort) %}<input type="checkbox" name="delete_effort" value="{{date}}" />{% endif %}</td>