Putaway Strategy error

Dear experts,

I have following situation in my storage type:

So as you see, 5 bins are in the storage. Every storage has 2 logical positions and as you see there one HU in every bin.

But the second logical position is actually free, but when I try to create a WT the system cannot find the storage bin...

My Customizing looks follwing:

Sorry for many screenshots, but I still not understand why the HU cannot be putted in the second free logical positions of the storage.

THanks in advance

BR

Denis