@Nikos

If you put this code in your page ( K2 item.php layout for example ) then the module position "belowcontent" will be loaded in every item page. In that case the menu assignment in module page has no effect. You can also assign this module to "All Pages". This will not affect your site if this position is not loaded in your main template file.

Lefteris Kavadas wrote: @Nikos

If you put this code in your page ( K2 item.php layout for example ) then the module position "belowcontent" will be loaded in every item page. In that case the menu assignment in module page has no effect. You can also assign this module to "All Pages". This will not affect your site if this position is not loaded in your main template file.

So the module position is loading but what about the module itself? What more do I have to do than publishing it in belowcontent position without any assignment?

Publish the module. Also assign it to "All Pages" just in case this affects the output. If you have this position to your site also, then create another position and put the module there.

I don't want it to be shown in all pages only in item page. In your opinion you suggest me to create another module position into k2 item.php file and publish the module in all pages? How can I do that just by entering

< jdoc:include type="modules" name="belowcontent_item" style="xhtml" / >

is that enough and then run the script above?
Do I have to change the xml template file?

yes it worked I just wrote at the end of the item.php