policy inconsistency

Hi,
  I'm looking into understanding the different types of policy inconsistency. Are you aware of any work on this topic? 
  A common case of inconsistency is when two rules have the same <subject, object, action> tuple and the rulings are conflict with each other (permit and deny). Do you know of any other examples of policy inconsistency? 
   
  Thanks,
   
  koko, 

		
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