Yes it is because of that extra column. So what is happening here is Anaplan expects every column apart from Column 1 and Column 3 to be Time Formatted because Time is kept as Column headers, hence the error.
Why Import? Why don't you control with the help of formula? Are you taking a snapshot?
Hi @Jsdeloria21 ,
Try using pattern with separation Y-M because in the mapping your target is showing in YYYY-MM format