issuable

from The Collaborative International Dictionary of English v.0.48

Issuable \Is"su*a*ble\, a. [From {Issue}.]
   [1913 Webster]
   1. Leading to, producing, or relating to, an issue; capable
      of being made an issue at law. --Burrill.
      [1913 Webster]

   2. Lawful or suitable to be issued; as, a writ issuable on
      these grounds.
      [1913 Webster]

   {Issuable plea} (Law), a plea to the merits, on which the
      adverse party may take issue and proceed to trial.
      [1913 Webster]

from Bouvier's Law Dictionary, Revised 6th Ed (1856)

ISSUABLE, practice. Leading or tending to an issue. An issuable plea is one 
upon which the plaintiff can take issue and proceed to trial.