R. 4:6-7. — Waiver or Preservation of Defenses

Defenses (b) (c) and (d) in R. 4:6-2 are waived if not raised by motion pursuant to R. 4:6-3 or if omitted from a previously made motion to which R. 4:6-6 is applicable. Defenses (e) and

(f) and an objection of failure to state a legal defense to a claim may be made in any pleading permitted or ordered, or by motion for summary judgment or at the trial on the merits. Whenever it appears by suggestion of the parties or otherwise that the court lacks jurisdiction of the subject matter, the court shall dismiss the matter except as otherwise provided by R. 1:13-4.