Any ideas??

I too wondered about this - I've never tried it, but I did wonder if the config/packages/* config took precedence over the config/[env]/* config. Maybe that's what's happening here to you. It'd be interesting to see the answer to this one.

Each package config folder can also have environment sub folders, so the correct path should be like this:

app/config/packages/PACKAGE_AUTHOR/PACKGE_NAME/prod/config.php

Yes that is exactly what i have.... And this the second package it happends to me that theco fig in prod doesnt work

Well, according to your first post it is not what you have. You put the packages directory under the prod folder, where as my example has environment sub folders in the package folder.

Wow... Sorry I'm stupid. Just noticed thanks!!!