Sp5: Category Field: no versioning/staging enable -> everything goes live straight ahead - no workflow status modification

I have a std double page which is validated. I went on the metadata sub-engine and in the category field. I add a few category (just select the checkbox) and clicked on ok. No othre change in my container.

-> the workflow state is staying green. No possible validation
-> in Live mode the categoriy modifications are directly applied (I am usng the category browins template to verify what is available)