Homatic Binding missing channels

Hello,
I’ve build a Homematic Actor Hardware with the Arduino AskSinPP Library and the Firmware from here:

It’s like a “normal” HM-LC-Bl1-FM rolloshutter actor, but it has two rolloshutter channels.

For the openHAB Gateway i use Homegear with a cc1101 spi module at the same rpi like OH.
Homegear detects the two channels of the actor (part of the “config print” output) correctly:

MASTER
{
Channel: 2
{
[TRANSMIT_TRY_MAX]: 06
[STATUSINFO_MINDELAY]: 04
[REFERENCE_RUN_COUNTER]: 00
[AES_ACTIVE]: 00
[STATUSINFO_RANDOM]: 01
[CHANGE_OVER_DELAY]: 05
[REFERENCE_RUNNING_TIME_BOTTOM_TOP]: 01 f4
[REFERENCE_RUNNING_TIME_TOP_BOTTOM]: 01 f4
}
Channel: 1
{
[TRANSMIT_TRY_MAX]: 06
[STATUSINFO_MINDELAY]: 04
[REFERENCE_RUN_COUNTER]: 00
[AES_ACTIVE]: 00
[STATUSINFO_RANDOM]: 01
[CHANGE_OVER_DELAY]: 05
[REFERENCE_RUNNING_TIME_BOTTOM_TOP]: 01 f4
[REFERENCE_RUNNING_TIME_TOP_BOTTOM]: 01 f4
}
Channel: 0
{
[ROAMING]: 00
[POLLING_INTERVAL]: 3c
[CONF_BUTTON_TIME]: ff
[INTERNAL_KEYS_VISIBLE]: 01
[POLLING]: 00
[LOCAL_RESET_DISABLE]: 00
}
}

Also a CCU detects both channels.
But in OH the thing only has got the first channel.
I’ve added a second rolloshutter item by hand by changing the channel number from 1 to 2, but it doesn’t work.

Anyone here, who has an idea about this problem?
Is this an Homegear or OH Binding Problem?
What can I do/test?
Thanks!
Dirk