Unit price on the invoice, without discounts

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Unit price on the invoice, without discounts

Hi I have the 1.6 version of prestashop, in the print of the invoice in the unit price / taxes incl) I get the discounted price, but I would like to see the full price without the discount, how can I do?

I tried and found this variable in the invoice.tpl file

{if $tax_excluded_display} {displayPrice currency=$order->id_currency price=$order_detail.unit_price_tax_excl} {else} {displayPrice currency=$order->id_currency price=$order_detail.unit_price_tax_incl} {/if}