Alcohol Regulatory and Licensing Authority chairman Judge John Hole said it was unfortunate the board did not have a lawyer because the appeal was the first heard by the authority against a district licensing committee decision on an off-licence since alcohol laws were revised in 2012.
"We are all feeling our way today as to how these appeals are going to be conducted," he said. "It is unfortunate that all the parties are not represented by legal counsel."
Wickman Way Price Cutter director Jagjit Janjua was represented by Brookfields partner John Young.
Southern Cross Campus was represented by lawyer Dr Grant Hewison but its appeal was struck out because it was not an objector to the original application for the licence, which was advertised during school holidays.
Mrs Sosene told the hearing the local board had heard "an extraordinary outcry"against the liquor store. "Every board member had been approached multiple times by parents, youth and community leaders telling us we had to appeal."
There were already 108 liquor licences in the board area, including another off-licence and an on-licence within 1km of the proposed store.
Mrs Sosene said Mangere East was "one of the most socially deprived and vulnerable communities in New Zealand".
The licensing committee had put too much weight on an undertaking the Price Cutter would stop selling beer and wine in its existing ground-floor shop, she said.
Mr Young said Mrs Sosene had not established legal grounds for an appeal.