JE Approval Limits and Contingent Workers

We have just implemented HR/PR, and our contractors are now setup as contingent workers, not employees.  As a result, we are getting errors on the JE approvals because the approval limit is not set.  But, when we try to set it, the person is not able to be found through the approvals screen because they are a contingent worker, not an employee.  Any suggestions on how to work around this with our current setup?  Thanks