He told an Inspector that he had felt "fobbed off" in a meeting around his performance implementation plan.
He also said being asked to supply a doctor's certificate every time he was off work on sick leave was unreasonable. This he described as "bully boy" tactics.
Ms MacKinnon said the failure to lay the grievance claim within 90 days was due to his lawyer being unable to represent him because of a conflict of interest.
She said Mr Howse believed the grievance had been laid within the 90 day period in the form of a legal letter, however this was not the case.
A mediation between the Commissioner of Police and Mr Howse would be the first instance of a resolution to the grievance claim, she said.