I'm very much in line with Steven that having a link which in the end won't work isn't really smart.

Just created a new component to realize Steven's idea. See ...

https://www.opensource-socialnetwork.org/component/view/3682/restrict-group-creation

@Oliver
Hä? Arsalan already explained that in the very first answer.
Be sure to add the redirect(REF); as said in the comment of mine.

This is an option I need.
Which file is the right place to lokk at (OSSN 5.1)?

@z-man thanks i added the redirect line and it works.

It says you can not create group and then successfully create group.
Low and behold the group was actually created

@Asarlan I tried it but user can still create group

Oops, ya: a line is missing.
Add
redirect(REF);
below ossn_trigger_message...

Sorry, but this only made a warning show up but still created a group. Thank you for trying though.

Simply put following in the HelloWorld/ossn_com.php (at end of file)

function ossn_restirct_group_creation_init(){
	ossn_register_callback("action", "load", "ossn_restirct_group_creation");
}
function ossn_restirct_group_creation($callback, $type, $params){
		if(ossn_isLoggedin()){
				if(!ossn_loggedin_user()->isAdmin() && $params["action"] == "group/add"){
						ossn_trigger_message("You can not create group", "error");
				}
		}
}
ossn_register_callback("ossn", "init", "ossn_restirct_group_creation_init");