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REP-3101: All selected Down and Across repeating frames must be nested.

Cause:

You tried to create a matrix (using Arrange--\>Create Matrix) and the Down and Across repeating frames were not properly overlapping and nested.

Action:

Make sure the selected Down and Across repeating frames are properly overlapping and nested before creating the matrix.

Note:  For help on other error messages, see Finding error message help.