When creating a new notification rule there are conditions that make up those rules. It displays the conditions as AND when it would be preferred to use OR statements. If not it would be possible to create multiple AND conditions.
currently it is not possible to change to any different operator. If a specific rules has more than one condition, all conditions needs to be met.
I found the following request on this in our ideas.rallydev.com : https://ideas.rallydev.com/ideas/D3268
and would suggest that you vote and comment on this topic.
See also How can I raise an enhancement request for Agile Central? concerning enhancement requests for Agile Central.
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