Unable to change Price on Goods Return

Forum,

I have a user who is unable to change the price on a Good Return. I have been into Administration > System Initialisation > Authorisations > General Authorisations > Stock Management > Price Lists > Price Lists. 'Item Cost' is marked with full authorisation but this still doesn't allow price to be changed.

Where else is the authorisation control for users to be able to change prices?

Regards,

Juan