Error while doing sales return "Special Stock Q not supported (check your entry) Message no. M7146"

Hi Experts,

I am doing sales return process. While doing PGI I am getting following error “Special Stock Q not supported (check your entry) Message no. M7146”

I generated SO-> Delivery-> PGI-> invoice -> Billing.

I am doing sales return using billing reference number.

Sales return in VA01 -> VL01n-> Vl02n (but getting error here)

Thanks in advance.