An error message was prompted which indicates that "
Unit is not ready for this operation >> RouteStepInvalid" while user is transacting the unit through ATE. However, the unit was processed successfully and has passed the operation.
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In order to find out the reason, user can go to Inquiry > ATE Log to get the details of the processed log file. In this case, the error message was prompted because user submitted a file that consists of the processed units.
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Action Required: User