AssociateTag for Amazon Product Advertisting API mandatory

I recognized at the end of october 2011 that my Amazon Product Advertising Classes are not working anymore. The reason ist that now a parameter called „AssociateTag“ is required which wasn’t before. You’ll find the whole description in german language here: http://blog.emeidi.com/2011/11/13/der-associate-tag-ist-fuer-die-amazon-product-advertisting-api-nun-zwingend/
If you prefer english please check https://affiliate-program.amazon.com/gp/advertising/api/detail/main.html