You have created a custom part label, but when you print the labels, an extra blank label is printed at the beginning or end of the series of labels.
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If the label contains group header bands, set the GroupHeaderBand property "KeepGroupHeader" to False.
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Adjust the databand height property downward by small increments until the blank page is eliminated. Be careful not to change the height too much, or the label may print off-center.
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If the label contains a group header band, set the GroupHeaderBand properties "New Page Before" and "New Page After" both to False.
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