Schedule K-1, Form 1120S, Box 13 -- stuck on two problems

I've entered a K-1 for S Corp that has no amount in Box 13. Two problems:

 

#1. During Smart Check, it flags form 1120S (Schedule K-1 S Corporation Additional Information), Line 13, Code E, Line 1, as required entry.  No credit is being taken, thus it must be blank.  Can't find a way around it. 

 

#2. While trying to trouble-shoot problem #1, discovered another issue.  During the K-1 interview where it asks to check which boxes have information, Box 13 can be checked, but it can't be unchecked . It does not toggle checked/unchecked.  (This characteristic is also true for Box 12, but that may be by design -- I don't know.)  

 

Need assistance. Will not reenter this entire K-1 only to find the same issue.  If no response here, I'll try the help center, but not looking forward to that.