In the program, return orders are usually deleted after they are invoiced. When an invoice is posted, it is transferred to the Posted Sales Credit Memo window and, if the Return Receipt on Credit Memo check box was selected on the Sales & Receivables Setup window, the Posted Return Receipt window.
In certain situations, you may need to delete invoiced return orders that were not deleted or you may need to reduce the number of posted invoices.
You can delete the orders with the Delete Invd Sales Ret. Orders batch job.
Open the 
Delete
Invd Sales Ret. Orders batch job request window.
To select the orders to be deleted, you can set filters in the No. (order number), Sell-to Customer No., and Bill-to Customer No. fields.
When you have set the filters, click OK to execute the batch job.
The program checks that the deleted sales return orders have been fully invoiced. You cannot delete orders that have not been fully received and invoiced.
Deleting Invoiced Sales Orders
Deleting Invoiced Blanket Sales Orders