Quantity Remaining on Pick Ticket

Hi all

I am designing a new advanced layout pick ticket and am having diffculty getting the quantity remaining to show.

Can anyone help?

I did see the below on StackOverflow but this hasn't worked for me:
<#list salesorder.item as tranline>     <#assign shipped=0>     <#assign prevShipped=tranline.quantityfulfilled>     <#assign qtyRemaining=tranline.quantity - prevShipped>     <#if (tranline.quantitybackordered gt 0)> <#assign qtyRemaining=tranline.quantitybackordered></#if>     <#list record.item as item><#if tranline.line==item.orderline>         <#assign shipped=item.quantity>         <#assign prevShipped=tranline.quantityfulfilled-item.quantity>     </#if></#list>     <tr>     <td colspan="12"><span class="itemname">${tranline.item}</span><#if tranline.itemtype =='NonInvtPart'>**<#assign anyNonInvt='T'></#if><br />${tranline.description?html}</td>     <td align="center" colspan="3"><#if shipped gt 0><b>${shipped}</b><#else>0</#if></td>     <td align="center" colspan="3">${tranline.quantity}</td>     <td align="center" colspan="3">${prevShipped}</td>     <td align="center" colspan="3">${qtyRemaining}</td>     <td colspan="4">${tranline.options?html}</td>      </tr>     </#list> </#if>  Any help would be great