The first thing to look at when the SLA Reports link doesn't show in the UI is that you have the SRC/SSM Content License installed in your license server . This license enables the functionality of the reports and SLA's in general.
. If the user does not logout or closes SBM by closing the browser[2] then the license will be released after 60 minutes of inactivity plus up to 12 minutes for License Manager to get around to cleaning up freed licenses.