Currently there is no correct quality test result registration history (report). You can only check the created by/modified by of the last registered test result. To check this you also have to drill down to the specific quality order test in the quality order line results form. 2 issues with that :

• No history of previously registered test results, only the actual test result is shown
• You should be able to consult quality order test result registration history in an overview form iso drilling down to a specific test of a specific quality order