Note: OSPF distance command is no longer affected in single process OSPF path selection by CSCeh46993 fix.
https://supportforums.cisco.com/discussion/11135326/ospf-distance
http://ieoc.com/forums/t/1505.aspx?PageIndex=2
https://supportforums.cisco.com/ja/document/45506
Not sure but in my study, distance command does not work if database has multiple source to the network. With a single source, the command seems to work fine (able to change distance value.)