Some participants forget to submit their registration or don't finish the registration.
In the query there is an option 'Not submitted'.
Go to the query and click on 'Not submitted'.
The next screen will appear
In the not sumbitted query the PCO can find the participants who didn't finish their registration. The PCO has the possibility to submit the participant by checking the checkbox and click on 'Submit checked participants'.
The registration will be finished by the PCO.