error in VL02n

Hi All,

I am getting one error message during Post goods issue of Material for STO Purchase order.

I am doing the Post goods issue in T code VL02N

Error is " Deficit of 50 pcs in storage location fg00". I am not able to change the SLoc in this transaction.

but the stock is lying in sc00 location. Why the system is considering fg00 location. How to change this?

What is the settings required to be done.

Regards,