Fsbuild-2 Flight Planner

Hi all,
new in this forum, and new to the use of this beautifull flight plan builder.
After some reading and testing I have one question:
I'm trying to create a flight plan using the nats. I was able to make a flight plan from egll to kjfk with track D (or similar) in this way:
dep: egll ; dest : kjfk; select PM ; select Dn ; select trackD
select SUNOT (from)
select FOXXE (to)
push green button
Close PM and in the line EGLL SUNOT TRAKD FOXXE KJFK added the * in this way:
EGLL * SUNOT TRAKD FOXXE * KJFK
Click autogenerate and the result is a plan like this:
EGLL BUZAD SID DCT WELIN T420 TNT UL28 RODOL UP6 BESOP UN551 NIBOG UN550 SUNOT TRAKD FOXXE YR J564 PQI J55 ENE.ENE4 KJFK
Thsi is right
If I make the same identical procedure from EGLL to KLAX after choosing AUTOGENERATE I have a totally new flight plan without the NAT.
The string which I start from is:
EGLL * BALIX TRAKA LAKES * KLAX
after autogenerate:
EGLL BUZAD SID DCT WELIN UN57 POL UN601 MARGO UN590 NINEX UP59 BALIX 5919N 5829N 5738N 5547N CARPE 5E16 HITOR YFC J581 PUT J42 GVE J37 AJFEB J52 ATL LGC MGM CEW MRITA ENI OAK AVE FIM LAX KLAX
The nat is disappeared. What is wrong?
Thanks in advance

Andrea