There are some inputs for K-1s that just throw a wrench in Lacerte being able to not error out on calculating QBI.  UPE is the most common one, but there are others. It's hunt-and-peck method to find them, there's not a master list (at least that's available to us). If you can't see what's different about this K-1 and you want to know, you can call Support, but it's a toss-up as to whether or not they'll be able to find it for you.