Setting up View Only Responsibilities for Approvals Management Administrator and Business Analyst

 Does anyone know how you set up the view only responsibilities within Approvals Management Engine.  We tried the Approvals Management Systems Viewer and the Approvals Management Process Owner but you still has full access.  We think it has to do with the permission sets but are going round in circles.  If anyone has detailed instructions to do this for transaction type Payables Invoice Approval, we would certainly appreciate some help.