You need to enable the "main menu" in the menu settings for your content type.<div><br></div><div>See <a href="http://drupal.org/node/761648">http://drupal.org/node/761648</a> for an explanation. This is a D6->D7 upgrade bug, fixed around a month ago.</div>
<div><br></div><div><br><br><div class="gmail_quote">On 20 May 2011 18:21, Reka Sandaruwan <span dir="ltr"><<a href="mailto:rekasandaruwan@gmail.com">rekasandaruwan@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
<div>
<p>I was create content type and view for upload some content. <br></p><p>then i
was create sub menu item under main menu (using nice menu module) <br></p><p>for
each node of uploaded content. after i was edit those content, then
menu of that updated contents was discard. <br></p><p><br></p>
<p>please anyone can help me immediately.</p>
</div><br clear="all"><font color="#888888"><br>-- <br>Sandaruwan<br><a href="http://openmindsl.wordpress.com" target="_blank">http://openmindsl.wordpress.com</a> <br>
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<br></blockquote></div><br></div>