Thanks guys...I got it working (at least I think so...). I had to change my scan event like this:
Code:

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var min_dist;
////scans for enemies
function scan_enemies()
{	
	min_dist = 999999;
	////we are scanning
	my.is_scanning = on;

	////set scan mode
	my.scan_mode = scan_search;

	////set scan cone
	temp.x = 360;
	temp.y = 0;
	temp.z = my.attack_range;

	////do the search/scan
	c_scan(my.x,my.pan,temp,ignore_me + scan_ents);

	////wait a little before next scan (performance reasons)
	wait(-scan_search_sleep);

	////we have finished scanning
	my.is_scanning = off;
}

function entity_search_scan_event_fight()
{
	if(event_type == event_scan){
		
		if(you){
			////some conditions to set the handle
			if(you.scan_mode == scan_search && vec_dist(you.x,my.x) < you.attack_range && you.entity_type_id >= 0 && you.allied_id != my.allied_id){

				
				if(vec_dist(my.x, you.x) < min_dist)
				{
					min_dist = vec_dist(my.x,you.x);
					you.enemy = handle(my);
				}
			}
		}
	}
}
  

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Then I simple do like this in the entity action:
Code:

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    ...

    if(my.is_scanning == off)
    {
     ////scan for enemies
	scan_enemies();
    }		
		
    if(my.enemy){
			
        //get a pointer to the enemy!
        you = ptr_for_handle(my.enemy);
			
        //if the pointer is valid
        if(you){
        blablabla...do things!
        }
				
				
    }

    ...
  

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