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"The queries for the set operation are incompatible" report error

Why do I get the following error?
Error Message: The queries for the set operation are incompatible


The Analytics error message, "The queries for the set operation are incompatible" happens when a union in the report attempts to merge different types of data items, the queries in a union have different numbers of items, or the data items in the queries are not in the same order. See the IBM Cognos article below for further information on what causes this error when writing a report:

http://www-01.ibm.com/support/docvie...id=swg21338754