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Desktop Mac user. Spent 2 hours w/TT Tech Support yesterday regarding this.
Under Wages & Income/Less Common Income/Misc Income/Other Reportable Income (was for a UK Pension).  Entered requested brief description & taxpayer amount. 
As a 25+ year TT user, I've had this same deduction for many years, w/no problems.
Submitted returns. Within an hour it was rejected by IRS.  Code indicated there was no 'explanation' of what the 'other reportable income' was.
Went back & checked: Saw Schedule 1 Line 8z.  Amounts populated, but not explanation.
3 techs later, nothing resolved.  Level 2 Tech, was extremely arrogant & told me to 'print it out, write it in & mail it'.  Really?  He then said it would be escalated &  I'd receive an email w/case #, etc. Didn’t happen.
 
Not sure where to go w/this. Obviously a bug in the software.