Re: Year Month Autonumber should be incremental order
Autonumber is numbering your YM in order of firat appearance. If the first apperance in your data is 'November 2019' then it will be classed as 1. To ensure the desired autonumber order you need to control the order of first appearance for the field values in your data model.
This could be ensured I multiple ways, but most common would be using an order by or generate the dimension using a controlled script loop.