-<tr><th>default effort</th><td class="input"><input type="number" name="default_effort" value="{{ task.default_effort }}" step=0.1 size=8 required /><details><summary>history</summary><ul>{% for k,v in task.default_effort_history.items() | sort(attribute='0', reverse=True) %}<li>{{ k }}: {{ v|e }}{% endfor %}</ul></details></td></tr>
+<tr>
+<th>default effort</th>
+<td class="input">
+{% if task.subtasks %}
+{{ task.default_effort.now }}
+{% else %}
+<input type="number" name="default_effort" value="{{ task.default_effort.now }}" step=0.1 size=8 required /><details><summary>history</summary><ul>{% for k,v in task.default_effort.history.items() | sort(attribute='0', reverse=True) %}<li>{{ k }}: {{ v|e }}{% endfor %}</ul></details>
+{% endif %}
+</td>
+</tr>