California Code
CHAPTER 3 - Issues The Mode of Trial and Postponements
Section 589.

589. An issue of law arises:

(a) Upon a demurrer to the complaint, cross-complaint, or answer, or to some part thereof.

(b) Upon a motion to strike made pursuant to Section 435, 436, or 473.

(Amended by Stats. 1983, Ch. 1167, Sec. 8.)