Return Sales Order

Hi Friends,

We have created a sale sorder for jobwork, against that production order has been created and the material taken as sales order stock and delivered the material. Now, customer want some material needs rework. He has sent back some material. Now we have created a return sales order and created out bound delivery. now while doing the post gooods issue for this outbound delivery(so that it will come into our stock), system giving the error message as "special stock E not supported". please reply....