If a user submits an order that has a line or lines with $0 price, and if your Crik-IT portal is configured to send submitted orders to QuickBooks as sales orders, some subscribers have said that when they convert the sales order to an invoice in QuickBooks, the $0 priced items don't appear on the printed invoice.  

In fact, this issue has nothing to do with Crik-IT.  This is controlled by a QuickBooks preference.

Here's how to control that: