First I will say thanks to you Grimber and you vlau.
Thank you JCL, moving my thread to the beginners forum, thanks for your bad doing!
Ok Grimber, it's not a problem of the malabar exporter, the Alpha is still 100% after exporting. In earlier version of A6 the exporter form malabar makes no problems. So something must be changed in the engine, that this happens with the mdl models.
So vlau I will try your workaround. Thanks to both of you.
Bernd