SAP Message QP217 - Char. &1: Mstr insp. charac. already used in char. &2 (operation &3)

Diagnosis
The master inspection characteristic is already being used ascharacteristic &V2& in operation &V3&.
If you want to use a master inspection characteristic in a task listmore than once, you cannot print the master inspection characteristicon a certificate. You should also not use the master inspectioncharacteristic as a SPC criterion for the control chart.