BGP Problem

Hi
I’m trying to set a BGP session with one of my ISPs but the following error occur all the time:

route,bgp,error UPDATE message error: 
route,bgp,error  Attribute Flags Error

Another peer is working without problems.
MT 3.11 x86 Intel
Any ideas?

After some research i think i know what is the nature of the problem - transparent AS, is that feature supported by MikroTik?