I found that without the code below (this code causes MRP_REPAIR to add order lines both to the REPAIR ORDER and SALES ORDER), adding a product with a price doesnt get calculated in total field, and shows zero (0)

elif this.repair_sale_order_line_id:

                sale_obj = self.pool.get('sale.order')

                so_vals = {

                    'partner_id' : this.repair_sale_order_line_id.partner_id.id,

                    'fleet_id': this.repair_sale_order_line_id.fleet_id.id,

                    'responsable_id': uid,

                }

                created_so_id = so_obj.create(cr, uid, so_vals, context=context)

                sol_vals = {'order_id': created_so_id,

                           'price_unit': this.price_unit,

                           'product_uom_qty': this.product_uom_qty,

                           'price_subtotal': this.price_subtotal,

                           'discount': this.discount,

                           'product_id': this.product_id.id,

                           'tax_id': [(6, 0, [x.id for x

                                                     in this.tax_id])],

                           'name': this.name,

                           }

                self.pool.get('mrp.repair').write(cr, uid, this.repair_sale_order_line_id.id, {'sale_id':created_so_id},context=context)

                sol_id = sol_obj.create_sol(cr, uid, sol_vals, context)

                super(repair_sale_order_line, self).write(cr, uid, [res],{'sale_order_line_id':sol_id})

it seems that the Sale Order lines are used instead of the internal Repair Sale Order lines. The question is: how can i make the mrp not depend on the SO or its ORDER LINES.?