I migrated from Magento 1.6.2 to 2.0.2 with the official data migration tool.
In general, it worked. But I cannot modify any product (no field is displayed). I suspect it is due to the fact that all the new system attributes (like category_ids) and the set of attributes "Default" are missing.
I just don't know why these attributes are removed and what to do about them.
Any help is greatly appreciated!