annex?

[tsphu]

I can't annex or vassal province outside exclusive zone.Is it a bug?
(My vassal logistics is level 4)

[tiger]

To annex, you mst have border with that province/npc/terrain.
To vassal further, you must research vasal logistic. For example, vasal logistic 5 allows vassal till 27 im.

[tsphu]

What is imperial mile?Due to my vassal logistics, I can vassal in 23 im.But I can 't vassal province in distance=9. 

[tiger]

You can only vassal npc towns, not provinces. And to annex provinces, you need centralization. By holding mouse on some npc town you see distance in imperial miles.