Hi Pascal. Interesting question. The answer is "no" while using Odoo out of the box. For that you need to change how the pricelist get applied to calculate the product unit_price in the sale order line, to remove the warning dialog that prevent for calculate anything in the onchange that use the pricelist. Review it at the method product_id_change of the sale.order.line model. The warning is at this line:
warning_msgs += _("No valid pricelist line found ! :") + warn_msg +"\n\n"
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That error is due to the method price_get_multi of the model product.pricelist is not able to calculate an unit price for the product because it's using it in an sql query. Changing that sql query you could be better on this