RCW 46.63.070(5)(b) states:
Quote Quoting RCW46.63.070(5)
(b) A person may not receive more than one deferral within a seven-year period for traffic infractions for moving violations and more than one deferral within a seven-year period for traffic infractions for nonmoving violations.
Since a parking or non-moving infraction can also be deferred, it doesn't stand to reason that they would affect a moving infraction deferral. But that's just my interpretation -- I could be wrong. You could try calling the Clerk of the Court and ask.

Barry