How to add a Procurement Contract to eProcurement Special Request

I am trying to figure out how to add a Procurement contract to an eProcurement Special Request. I've created a general contract and a Purchase order contract with the description only item and approved/dispatched it. Then went to eProcurement and created a special request and added to my cart. When I click on line details on the eProcurement checkout page the contract information is greyed out and I cannot associated the contract to it. Default Contract on Req is checked for the business unit as well. Are there any steps I am missing?

Thanks,

Nick