To do this, we entered the CTR via VRP N. 

Fine, SD shows all the reporting points .

But, then came the clearance "after LA, enter  southern holding". Where the hell is the southern holding?

I know, this is depicted on the DFS apporach charts, but are they also shown in SD?

If not, then this should be added

SkyDemon shows circuits, arrival/departure routes and reporting points for most airfields. It's still a good idea to check with the airfields themselves if there are additional local procedures to follow though.