You may want to look at two preconditions in RTC:
Prevent links by approvers
Require Disinterested Approvers
See the details in:
https://jazz.net/help-dev/clm/index.jsp?re=1&topic=/com.ibm.team.scm.doc/topics/t_scm_eclipse_process_preconditions.html&scope=null
David Lafreniere selected this answer as the correct answer
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