Thank you very much for your help Stevea,
This code was working correct until the latest update that i did to theme and fusion-core plugin.
After that it doesn’t work anymore.
I have tried everything (many many times flusing permalinks from wp-admin/options-permalink.php)but it seems like register_post_type_args don’t work.
Then i just tried to set the $arg even manually in fusion-core plugin code (/wp-content/plugins/fusion-core/includes/class-fusioncore-plugin.php) and still didn’t work.
I can not understand what is going on?
Any ideas would be appreciated.