In error, Barefoot Belgium used this code without realising it was already in use by Waterski. They already uploaded the file again using code 20BEL123 which is correct, however because the code is in use, obviously the user cannot remove the duplicate listing. Could you please do so on their behalf with thanks and apologies.
Duplicate code in other discipline should not be a problem, as internally, the discipline is used.
To remove the competition, the score must set the discipline where she/he wants to remove the code.