V_V1 Backorder processing issue

Dear Members,

As per my knowledge, when i run V_V1 backorder qty will be confirmed, But in my case when run the tcode V_V1

Confirmed qty became Zero(0), please let me know what is the solution to resolve it.

please go through below screen shot,

Before it was Qty 4, after running V_V1 it became 0  ???

Thanks in advance,

MK.