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How to avoid the "Defect number may not be left blank" message while updating Inspection

Product Feature: Inspection
This is due to the Inspection Category associated with the Inspection. In the Inspection Category, "Defect Number Required" check box would be checked and there is no defect number associated with the Inspection.

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To avoid this message, un-check the check box "Defect Number Required" from the Inspection Category. 

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UPDATED:  March 23, 2017