A motion for a new trial made under this rule or a motion to alter or amend a judgment must be filed and served within 21 days after entry of the judgment. An affidavit of merit or meritorious defense may be amended in accordance with the terms and conditions set forth in MCR 2.118 and MCL 600.2301.Michigan Legal Help has tools to fill many kinds of forms but we do not cover all areas. You may have a blank form that you need to fill out on your own. In Michigan, an affidavit of merit is required in a medical malpractice case. These rules govern the procedure in the United States District Court for the Western District of Michigan, govern the practice of attorneys before this court. Michigan Lawyers Weekly's Daily Alert. Sign up for your daily digest of Michigan Lawyer Daily News. Party Names that Can Change, Depending on What is Being Filed. The court may permit reply affidavits.