Rule 13 F.R.Civ.P. applies in adversary proceedings, except that a party sued by a trustee or debtor in possession need not state as a counterclaim any claim that the party has against the debtor, the debtor's property, or the estate, unless the claim arose after the entry of an order for relief. A trustee or debtor in possession who fails to plead a counterclaim through oversight, inadvertence, or excusable neglect, or when justice so requires, may by leave of court amend the pleading, or commence a new adversary proceeding or separate action.
11 APPENDIX U.S.C. § 7013
NOTES OF ADVISORY COMMITTEE ON RULES-1983Rule 13(h) F.R.Civ.P. refers to Rule 19 F.R.Civ.P. Pursuant to Rule 7002 this reference is to Rule 19 F.R.Civ.P. as incorporated and modified by Rule 7019.
REFERENCES IN TEXTThe Federal Rules of Civil Procedure, referred to in text, are set out in the Appendix to Title 28, Judiciary and Judicial Procedure.