DUT ID parameter meta data prompt changes are not set before OnTestPlanRunStart(TestPlanRun planRun) is called.
Changes made to DUT ID parameter in the meta data prompt window are not set in the TestPlanRun ResultParameter instance before OnTestPlanRunStart(TestPlanRun planRun) is called. planRun.Parameters ID parameter still has the original value set by the Settings >> Bench >> DUTs.