This error message appears if you click on the — (delete) button in the Format Results area of the Aggregation window without first clicking on one of the aggregation criteria in the list to the left of those buttons, selecting that criteria for deletion. Click OK to clear the message. Then, if you still want to delete one of the criteria, select it before clicking on the — (delete) button again.

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Andrew Post, MD, PhD

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Shirleen Hewitt, DBA


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Aik Choon Tan, PhD

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