2 upstreams 1 downstream BGP configuration optimization

[Kevin B]

Hello,

I have 2 upstream transit providers and 1 downstream customer we provide 
transit to - http://paste.debian.net/1086030/ (full Bird configuration 
with explanation)

There is a problem: Bird is exporting all the imported prefixes from my 
upstreams back to them. For example 10.40.40.0/24 is being exported from 
us even when AS20's customer doesn't announce it, because it is 
announced somewhere else in the full table and we just export it back 
from the full view.

Here is `birdc show protocols all` output - http://paste.debian.net/1086033/

I would like to prevent exporting the full view tables imported from my 
upstreams back to them, can you help me to understand what is wrong with 
the configuration and why does it happen?