Amendment of process or proof of service. The court may allow any process or proof

of service thereof to be amended at any time in its discretion and upon such terms as it deems just, unless it clearly appears that material prejudice would result to the substantial rights of the party against whom the process issued. [Report 1975; October 31, 1997, effective January 24, 1998; November 9, 2001, effective February 15, 2002]