This is not being maintained as I'm not working much with commerce right now. If you'd like to take over maintainership, please open an issue suggesting that.
This module is designed to repair missing fields from various commerce entities. After installing, visit the menu item that does the repair, admin->store->config->Repair Commerce Fields (admin/commerce/config/repair). Once you've done that you can uninstall the module.
If you're using a Commerce dev release after 3 November 2011, you don't have to patch Commerce at all. Earlier versions of Commerce require this patch to Commerce, which is now incorporated in the code.