Tvheadend

I use tvhadend latest.

Sat provider have two same CA pids in stream. With the same leingh and CAID and ident.
Card with oscam (server) give answer on each of them :(
One CApid is correct, other give no picter, but oscam give answer.

I try set prefered CA pid and save it. But no rezult - when i try to open that channel - CA-pid rewrites, and on same chennels tvheadend set it wrong.
So, no picter :(
How to set it forewer? And do not let it change and use only that I set?

PS: on my dreambox i set this pids in oscam.dvbapi. And all begin work on dreambox.