When a pleader fails to set up a counterclaim through oversight, inadvertence, or excusable neglect, or when justice requires, he may by leave of court set up the counterclaim by amendment. Source: SD RCP, Rule 13 (f), as adopted by Sup. Ct. Order March 29, 1966, effective July 1, 1966.
Omitted counterclaim
SDCL § 15-6-13(f), under RULES OF PROCEDURE IN CIRCUIT COURTS.
SDCL § 15-6-13(f)