144.—(1) On an appeal under section 143 the planning appeals commission must quash the enforcement notice, vary the terms of the notice or uphold the notice.
(2) On such an appeal the planning appeals commission may correct any misdescription, defect or error in the enforcement notice, or vary its terms if it is satisfied that the correction or variation can be made without injustice to the appellant or to the council or, as the case may be, the Department.
(3) Where it would otherwise be a ground for determining such an appeal in favour of the appellant that a person required to be served with a copy of the enforcement notice was not so served, the planning appeals commission may disregard that fact if neither the appellant nor that person has been substantially prejudiced by the failure to serve the copy of the enforcement notice.