Average Price & Price per Unit

Dear All,

I have an issue with an article which has an average price set to 0.

When i launch the transaction s_p00_07000139, i have the following result:

As you can see the column "Price/Unit (Bal.)" become null with a final stock almost null.

But, what i don't understand is why the column "Price per Unit" is fluctuated in function of movement 261 (GI for order).

For me, i believe that it does not change except for mvt 101 (PO).

Have you an idea ?

Thanks a lot

Rodolphe