Dear Team,
 
	I am trying to create a simulation in  PVsyst with Tracking horizontal axis E-W and I have 2 problems:
 
	1) I can not use bifacial modules when I use this configuration for my system. This is the error:  .If I don t use bifacial modules  I can run the simulation without any errors, but I need to do a bifacial simulation.
 
	2) I don't know exactly which one of these variants is correct:
 
	
		If I use Tracking horizontal axis N-S and rotate the modules in the shading scene with an -90 azimuth practically resulting an Tracking horizontal axis E-W system.
	
	
		On the other hand, the production is slightly higher if I use directly Tracking horizontal axis E-W in the orientation and the shading scene.
	
	Which one of these simulation is correct?
 
	Kindly help me with this situation.