same questions are here
https://answers.atlassian.com/questions/16700/how-to-make-the-component-a-single-selection-field
some workaround is there on following issue
https://jira.atlassian.com/browse/JRA-12543
similor post
http://www.j-tricks.com/1/post/2011/12/one-fixversion-please.html
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