Hi everbody who replies.
This question regarding the "limit distance for destinaton alternate" arose when the company I am working for, started to operate to Kabul to carry Military Personnel from Europe. We are operating under the JAA, as you stated, normally there is no need to mind the distance of destination alternate as long as the area of operation is confined within Europe.
But overall I understand now, there is no distance limit for a suitable destination alternate provided the operator did not violate 60-min ETOPS rule while diverting.
Thank you.