During the An Urgent Message mission you will find yourself at Jundland Wastes in Tatooine. This area is home to one of the many missions, such as Womp, There It Is.
This mission basically requires you to defeat certain enemy targets.
At Jundland Wastes in Tatooine there will be an enemy target that looks like a giant rat, when you get close to it, will end up burrowing itself under the sand. After burring itself it will then summon a bunch of its companions, defeat them all.
After having successfully defeated all of its companions, it will then reveal itself once again. Defeat it in order to complete this mission.
Quite a simple one really…