Adding W5 as a satellite

Onsat re****ts that AMC-18 has been assigned the mapping code W5.  But 
when I tried to set up W5 my DSR 922 won't let me.

It shows in the available codes when I press "options, 6,4,4" but when I 
pres "enter" on it I return to the grid showing all the available 
satellites.  I thought maybe I had reached some kind of memory limit so 
I tried adding another satellite (A6) and it worked just fine.

Is there a trick?  What am I missing? Or do I have a corrupted memory 
and I need to reinitialize and start over?

Thanks for the help.

Take care,
Rich

God bless the USA
-- 
Pat Paulsen (1927-1997) for President - 2008

Even though he's dead it makes about much sense
to vote for him as it does for the choices
that we have who are living.  At least he's not
going change his position on anything.