I'm in CA. I've seen a few 593 withholdings, but none through a K-1. I would expect that Screen 55.012 is the proper input. I don't think it matters to show it as coming through the K-1.
*If this (or another answer/reply) solves your problem, please click "Accept as Solution" to get this post out of the "Unanswered" queue of posts.*
