knife ec2 server create not possible for eu-west-1 AMIs

ubuntu@ec2:~$ sudo knife ec2 server create "role[store]" -Z eu-west-1a -i ami-a54d67d1 -G default -x ubuntu
/var/lib/gems/1.8/gems/excon-0.2.0/lib/excon/connection.rb:69:in `request': The AMI ID 'ami-a54d67d1' does not exist (Fog::AWS::EC2::NotFound)
from /var/lib/gems/1.8/gems/fog-0.2.24/lib/fog/connection.rb:20:in `request'
from /var/lib/gems/1.8/gems/fog-0.2.24/lib/fog/aws/ec2.rb:193:in `request'
from /var/lib/gems/1.8/gems/fog-0.2.24/lib/fog/aws/requests/ec2/run_instances.rb:101:in `run_instances'
from /var/lib/gems/1.8/gems/fog-0.2.24/lib/fog/aws/models/ec2/server.rb:141:in `save'
from /var/lib/gems/1.8/gems/fog-0.2.24/lib/fog/collection.rb:47:in `create'
from /usr/lib/ruby/1.8/chef/knife/ec2_server_create.rb:124:in `run'
from /usr/lib/ruby/1.8/chef/knife.rb:127:in `run'
from /usr/lib/ruby/1.8/chef/application/knife.rb:118:in `run'
from /usr/bin/knife:25

But if you look at http://uec-images.ubuntu.com/releases/10.04/release/ you see that ami-a54d67d1 is valid AMI ID for the region eu-west-1.

Btw, I've tried several other AMI IDs, the only one command that worked for me was
> knife ec2 server create "role[store]" -i ami-2d4aa444 -G default -x ubuntu

The workaround is to create an instance
> ec2-run-instances ami-a54d67d1 --instance-type m1.large --region eu-west-1 --key pstam-keypair
and then bootstrap it
> knife bootstrap ec2-.....eu-west-1.compute.amazonaws.com -r "role[store]" -x ubuntu -i /home/ubuntu/.ssh/ec2_ssh_key --sudo