Southern Cross Campus have escaped a ban for fielding an over-age player at last December's Condors Sevens.
The girl in question, whom the Herald has chosen not to name, helped Southern Cross to the semifinals of the Condors girls' under-15s section. She was 16.
Tournament director Phil Gaze says he was not made aware of the infraction until late in the afternoon, so no action was taken, but it was referred to the New Zealand Secondary Schools Sports Council.
NZSSSC executive director Garry Carnachan says although Southern Cross breached the rules, there was "no deliberate attempt" to deceive.
"We have dealt with the principal, who has accepted full responsibility and assures me that their processes are changing so that it doesn't happen again," said Carnachan. "The coach has received a formal written warning. There were some mitigating circumstances around it which, as far as we are concerned, didn't warrant banning the coach."