Full garage but wants to park on CP

Our executive committee has granted permission for an owner to park on some occasions on common property, as they have 2 cars and only one garage. The conditions are that parking can only be on common property when there are no spaces available on the street.

Fair enough and this works well and is not abused.

However another owner who owns only one car has also applied to do the same. Although he owns a single garage, it is used for storage. He is pointing to the precedent of the previous decision to press his case.

I am of the opinion that, despite that, he should be refused and advised to park in his garage after clearing it out. Has anyone else faced this situation and if he is refused does he have a case to take it further e.g. to the tribunal?