"If the Germans get compensation from Poland then the Poles can ask for compensation from Russia and Belorussia and Lithuania."
Look at this:
http://www.freerepublic.com/focus/f-news/1158491/posts
Why should Germans get compensation from Poland? They should get their property back from the individual Poles that now occupy the property. Peoperty rights are not communal rights except in the United States and other socialist countries.