how to setup diseq on receiver (multiswitch + 2/1 switch)

[realist01]

My configuration is: on a spaun multiswitch 9/4 ist one quattro lnb (Astra 28.2E LNB A) on dish 1 connected (Position 1, or A ) a second one I wanna connect later. One output Port from the switch is connected to a 2/1 diseq switch (Port 2). Port 1 of this switch is connected to an other single dish 2 (Astra 19.2E, LNB . So one receiver should get all 2 satellites.
What is working on this receiver:
all channels on dish 2, switching between them, switching to lnb A and switch back
if I connect directly to the multiswitch I get all channels on dish 1 (lnb A).
but with the 2/1 diseqc switch between the best result is I get is one channel of LNB A after coming from LNB B. Switching between channels of 28.2 doesnt work.

So the problem must be a setting on my receiver?

My Receiver is: IPBOX 9000 HD.
Possible settings are:
Tone Burst Values (off, A,
Diseqc Values (A-D, 1-16)
uncommited switch Values (none, 1-16)
repeat diseqc Values (non, 1-3)
swap commands Values (no,yes)
repeat sequence Values (no,yes)

LNB B:
Tone Burst: off
Diseqc: A
all other setting disabled
=> working perfectly

LNB A
Tone Burst: off
Diseqc: B
uncommited switch: 1
repeat diseqc commands: 1
swap commands: yes
repeat sequence: no

=> I only get signal one time after I switched from LNB B, switching between channels on this lnb doesn't work

I think for full working LNB A I must tell at first to the 2/1 switch: use Port 2/B then to the multiswitch: use Satellite A.
But howto do this with this menu of my receiver?

Anybody has an advice?