Custom permalinks – post type – hierarchical taxonomy’s

I did folowed the steps / solution from Jeff it helped me alot with he’s settings, got it for about 90% working properly. But getting stuck on the post / postname. It loads now the producten/%taxonomy_products%/ without the 404 errors. But when i click further on a post i get the 404 errors again.

Maintaining strict one-to-one association between terms and custom posts

I’m building an inventory system where inventory items have their own page but where standard WordPress post post types can also be tagged with these inventory items. As far as I understand, this means I must implement both a custom post type (inventory) to provide each item’s page and a custom, non-hierarchical taxonomy (inventory_item) to represent the relationships between posts in the post post type and pages in the inventory post type. Each custom post type post would be associated with exactly one inventory_item term.