Hi all,
the problem is not solved till now, the import of wiki module from other cours does not work both for Nwiki and ewiki, I found that the problem is directly in moodle - look at http://moodle.org/mod/forum/discuss.php?d=89939 - there is no possibility to import module date - for wiki this means text content.
If I use Backup and I backup only the wiki module - with data and than I use restore from this file with "restore to existing course" - "add modules", everything is fine.