Stations not trading with each other...

[Gween]

So my problem takes a bit of explaining:

I have 2 stations:
Station 1: -is in Hewa's Twin and is producing Sunflowers (It's the one from the Teladi start scenario, I just modified it with a second sunflower production and more storage)
Station 2: -is in Trinity Sanctum III and produces Nostrop Oil as the final Product and Spices and Water as intermediate products Station 2 takes the needed Sunflowers from Station 1

Due to Station 2 having way too much Water, I wanted Station 1 to transport Water from there to Station 1, so that the only expenses are the needed Energy Cells.
I've set up everything correctly: (atleast I think so)
>Station 1 and Station 2 have transporters available
>I've restricted the trade of Water for Station 1, so that it doesn't buy water from npc stations
>the maximum buying price for the water set to 74Cr
>I've created a Selling offer for water on Station 2
>the Selling price for the water on Station 2 is 32Cr (My manager did that automatically because the storage is basically overflowing with water)

Result:
Station 1 now has 50 units of water left in the storage and the 2 traders I've allocated to the station only take care of the Energy Cell storage being filled to the brim...
The Sunflower Storage is almost empty because NPCs are buying them every now and then and they don't get produced anymore because of the lack of water.

So, my questions are:
>What am I doing wrong?
>What am I missing?
>Is what I planned even possible with automated behaviour? (I assume yes)

I'll provide more details as needed.

(I play in the 3.0 Beta, but I doubt that it has anything to do with that, so I won't ask in the beta forum)