The summons must be accompanied by an affidavit of the plaintiff or the plaintiff's agent, representative, or attorney that the judgment or some part of the judgment remains unsatisfied and must specify the amount due. It is not necessary to file a new complaint.
Mont. Code Ann. § 25-15-103
Affidavit to accompany summons -- new complaint unnecessary
Ap. p
Official source: Montana Code Annotated (Montana Legislature). Reproduced from public-domain Montana statutes; confirm against the official source for the current text. Not legal advice.