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Sep 15 '15, 12:54 p.m.
You have to go under Attribute Customization to write conditions, create validators, etc. before you can add to a specific work item attribute.
In the 5.0.2 doc
https://www-01.ibm.com/support/knowledgecenter/SSYMRC_5.0.2/com.ibm.team.workitem.doc/topics/c_customizing_attributes.html