When you create a new campaign , you select a campaign definition. The details that you specify for a campaign definition determine the information that is available. A decision treatment campaign determines the eligibility of each customer for an offer. You can create multiple decision treatment campaigns and assign them to a treatment campaign set.
See also:
https://communities.sas.com/t5/SAS-Customer-Intelligence/Relationship-between-registred-Treatment-and-Decision-Treatment/td-p/312588
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