http://blog.braini.ac/?p=38
this post above is missing some ACL rules

https://supportforums.cisco.com/thread/2159071
http://www.tek-tips.com/viewthread.cfm?qid=1524714
https://supportforums.cisco.com/thread/2094789
https://supportforums.cisco.com/thread/2050054

cisco doc
http://www.cisco.com/en/US/docs/security/asa/asa72/configuration/guide/cfgnat.html#wpxref77088
http://www.cisco.com/en/US/docs/security/asa/asa84/configuration/guide/mpf_service_policy.html#wp1163004