In the group properties on the Advanced tab there is a 'Success threshold' 
property.

Success threshold - This attribute helps set the criteria for reporting the 
success of all savesets within a group. The default value is "Warning" which 
means if any saveset completes with warning(s) it will be reported as 
successful. The client will also be reported as successful with warning(s) in 
the completion report. If set to "Success", any savesets completed with 
warnings will be reported as failures. Please note any failures will invoke a 
retry on the saveset if retry count is not 0. The client will also be reported 
as failed in the savegroup completion report.

Hope this helps.

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