Backtrack Every Page is not consistent with the current settings
Messages > Modal Messages > Scanning Messages (Q++) >
This message occurs if you try to use a Backtrack Every Page structure on a GridTemplate whose number of months is not a multiple of its number of pages.
Allowed : 6 months on 2 pages, 6 months on 3 pages (although weird).
Not allowed : 6months on 4 pages, 1 month on 2 pages.