SLA - Receivables Transaction Lines with zero dollars

Hi,

We import all our data from Order Management after fulfillment.  Typically the order amount is associated with quote line only and rest of the items are with zero dollars.  The items are listed on the order and on invoice for the benefit of the customer.

We would like to dispense with SLA accoutning for zero dollar receivables transaction lines.  Can members share their experiences on how they configured SLA or issues they experienced after they went live with the deployment of solution.

Thanks