"If the judgment goes the association's way it would be better to rethink the annual plan before it is passed than to try to unravel it afterwards," he said.
The chairman of the Kaipara commissioners, John Robertson, declined to discuss Justice Heath's advice, regarding it as a privileged communication.
"The judge will make his decision in due course," he said.
Retired lawyer Clive Boonham, of Mangawhai, said on his Kaipara Concerns website that a decision without reasons was rare and made it difficult for either party to decide on any subsequent action.
"Not only that, there is a time limit for an appeal which runs from the date when the decision is given. It is almost impossible to appeal if the reasons for the decision are not given," he said.
The decision might not be clear cut. "It is possible his decision could require a further hearing," Mr Boonham said.