A claim which either matured or was acquired by the pleader after serving a pleading may, by leave of court, be presented as a counterclaim by supplemental pleading.
Minn. R. Civ. P. 13.05
A claim which either matured or was acquired by the pleader after serving a pleading may, by leave of court, be presented as a counterclaim by supplemental pleading.
Minn. R. Civ. P. 13.05