Symptoms
Placeholders @@Detail_* (e.g. @@Detail_LineNumber@, @@Detail_Duration@, @@Detail_Comment@, etc) do not work - values are empty in the notifications sent.
Cause
The placeholders were not used inside the ##DetailList#...##/DetailList# tags.
Resolution
Modify the notification template, use the placeholders inside the DetailList tags. For example, change
<tr>
<td style="text-align: center;">@@Detail_LineNumber@</td>
<td>@@Detail_Comment@</td>
</tr>
to
<tr>
##DetailList#
<td style="text-align: center;">@@Detail_LineNumber@</td>
<td>@@Detail_Comment@</td>
##/DetailList#
</tr>