In SAS Customer Intelligence, communications with percent-based control groups that have a small number of offers might fail in a campaign group during the optimization process. When this failure occurs, you might see the following error message in the SASCustIntelCore6.x.log file:

This problem happens when the following criteria are true:

• You use a percentage-based (auto) control group.
• A small number of offers is selected by a Communication node. 
• All offers end up in the control group.

Because SAS Marketing Optimization is a large-scale optimization application, it is not a good practice to have communications with only one (or no) eligible customer because those values cannot be optimized. 

If you encounter this problem, contact SAS Technical Support to obtain a fix for this issue.

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