Hi,
tp_Stylesheet is a NULL-relationship of tp_XMLSchema. It´s fully depended on tp_XMLSchema. I never have seen a Lifecycle used for a NULL relationship and I am not sure if this is technically possible at all.
When ever you want to use this kind of sub-lifecycles, you would use regular relationships. But in this case I wouldn´t recommended to change the default ItemType. It´s simply to complex and too much change is required.
In my case I used the unorthodox way and added some kind of manual revision counter into the name of XMLSchema and Stylesheet. Not a PLM role model solution. But as this kind of work is only done by TechDoc Admins, you normally don´t have a lot of revisions.
Angela
