Show discount % in invoice code working in 1.6 not 1.7

[ptityop]

Hello,

We used to have the following this piece of code on our presta 1.6 to show the discount % of a product , but this is not working on the new version, I tried to add it to the tpl file but everything disappears when adding it ... any help would be appreciated. Thanks in advance

<td style="border-bottom: solid 0px black; text-align: top ; width: 10% ; line-height:20px;font-size:8px; ">
                  {if isset($order_detail.unit_price_tax_excl_before_specific_price)}
                  {displayPrice currency=$order->id_currency price=$order_detail.unit_price_tax_excl_including_ecotax}
                  {else}
                  {if $tax_excluded_display}
                  {displayPrice   price=$order_detail.unit_price_tax_excl}
                  {else}
                  {displayPrice   price=$order_detail.unit_price_tax_excl}
                  {/if}
                  {/if}
               </td>
               <td style=" border-bottom: solid 0px black;text-align: right; width: 10%">
                  {if (isset($order_detail.reduction_amount) && $order_detail.reduction_amount > 0)}
                  -{displayPrice price=$order_detail.reduction_percent}%
                  {elseif (isset($order_detail.reduction_percent) && $order_detail.reduction_percent > 0)}
                  -{$order_detail.reduction_percent}%
                  {else}
                  {if ($order_detail.reduction_amount > 0)}
                  {$order_detail.reduction_amount} 
                  {else}
                  -
                  {/if} 
                  {/if} 
               </td>

And also this on the table header is not working anymore 

<td style="border-bottom: solid 0px black; text-align: top ; width: 10% ; line-height:20px;font-size:8px; ">
                  {if isset($order_detail.unit_price_tax_excl_before_specific_price)}
                  {displayPrice currency=$order->id_currency price=$order_detail.unit_price_tax_excl_including_ecotax}
                  {else}
                  {if $tax_excluded_display}
                  {displayPrice   price=$order_detail.unit_price_tax_excl}
                  {else}
                  {displayPrice   price=$order_detail.unit_price_tax_excl}
                  {/if}
                  {/if}
               </td>
               <td style=" border-bottom: solid 0px black;text-align: right; width: 10%">
                  {if (isset($order_detail.reduction_amount) && $order_detail.reduction_amount > 0)}
                  -{displayPrice price=$order_detail.reduction_percent}%
                  {elseif (isset($order_detail.reduction_percent) && $order_detail.reduction_percent > 0)}
                  -{$order_detail.reduction_percent}%
                  {else}
                  {if ($order_detail.reduction_amount > 0)}
                  {$order_detail.reduction_amount} 
                  {else}
                  -
                  {/if} 
                  {/if} 
               </td>