Freight value during vendor returns not required

Hi,

In PO along with PO price PBXX we have a manual condition for freight. When a GR is done the freight value(credit entry) would show in the accounting document. When returns to vendor is done with movement 122 the freight value again shows in the accounting document as debit entry.

The requirement is that the freight value is not required for returns to vendor(mvt 122).

Please advice.

Regards,

Pratap