14707
The following diagnostic is generating:
A supporting schedule for income or loss allocated to Montana must be attached as a PDF document to all e-filed returns.
Solution:
Critical in 2018 wording is: e-file: A supporting schedule for income or loss allocated to Montana must be attached as a PDF document to all e-filed returns. (ref. @14707) Screen 3.2 Form or miscellaneous attachment expand (click the + next to) Misc. Attachments and choose Income/Loss Allocated to Montana