Use the Reports | Schemas | Campaign | [schema name] | Columns | [Contact Metric] property to add contact metrics to the Campaign Performance or Offer Performance reporting schemas.
If you use the sample IBM®Cognos® reports or create your own custom reports that include control groups, then each contact metric must have two columns in the reporting schema. One column represents the metric for the control group and the other column represents the metric for the target group. The value in Control Treatment Flag specifies whether the column in the view represents the control group or the target group.