... If I go to "manage URL links" I discover that the internal link says:
index.php?option=com_sobi2&sobi2Task=report_listing&sid=5&Itemid=1
and the correct link have to be just
index.php?option=com_sobi2&sobi2Task=report_listing&sid=5 without Itemid=1
I suspect that this may have not been the cause of your problem.
Joomla requires that all Internal URL's have an Itemid specified (otherwise, I believe, Joomla will use the ItemID of the default Menu Item)
The Itemid part of the URL matches the ItemID of a Joomla! Menu Item
Joomla! Administrator->Menus->
MyMenuName->Menu Item Manager
The Joomla! Menu ItemID is usually the far right column in the Menu Item Manager Display.
Joomla! uses this ItemID to determine which Joomla! Site Template is used to display the resulting output.
Joomla! Administrator->Extensions->Template Manager->
Template Name->Menu Assignment
(Joomla! 1.5.x allows different Site Templates to be assigned to different Joomla! Menu Items).
Were you getting an error messages when you attempted to access the Report Listings Form via the "Report Listings" link?
Are you using a "Report Listings" in the Details Template and/or the VCard Template?
Others have had a similar problem
Re: Report listing plugin not working when using the Report Listing Plugin with the SobiSEF plugin.
The problem is resolved by;
Setting
Joomla! Administrator->Components->SOBI2->Plugins->Report Listing->Allow anonymous=Yes
or else only logged in registered users can access the 'Report Listing".
You must allow anonymous in the plugin OR be logged in as a registered user if anonymous is not allowed.
If this solves your problem, then there is a problem with the Report Listing plugin allowing access to the Report Listing form
for anonymous users when non-SEF URL's are used and
Joomla! Administrator->Components->SOBI2->Plugins->Report Listing->Allow anonymous=No
Regards - Mark