hello
the price_unit on stock_move != price_unit on sale_order_line ?
example :
product ;sale_price;stock_move.price;product_uom
"External Hard disk";405.00; 390; 1
"Blank DVD-RW"; 24.00; 21.6; 2
"Printer, All-in-one"; 4410.00; 4258; 1