Summary data is missing or incorrect
To make sure that subsummary data displays correctly, consider these points:
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Before printing, sort by all of the break fields on which your subsummaries are based.
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Records with no value in the break fields will sort to the top, giving the appearance of no data. You can omit records with blank values in the break field before running a subsummary report.
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Make sure data has been entered consistently in the break field. For example, be sure that FileMaker, Inc. is not sometimes entered as FM. Use a value list to ensure consistency during data entry.
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Related topics 
Creating and managing layouts and reports
Troubleshooting layouts with summary or subsummary parts