try to remove the quotes from the selected values, you don't need them, and I believe that the field name `Canonical_Date.autoCalendar.YearMonth` will be translated to just `YearMonth`
so, in theory, `/select/YearMonth/2021-03` (even though I believe using `Canonical_Date.autoCalendar.YearMonth`would work too) should work, and if the date string have a numeric representation try using square brackets around it, ex: `/select/YearMonth/[2021-03]`
This took me one step closer. But still not all the way.
By using: select/Canonical_Date/[2021-03]
I retrieve a selection that makes the correct selection in field: Canonical_Date
However, most of my page is built of the selection in the Canonical_Date.AutoCalendar.YearMonth (as seen in the top left corner) I still need the receiver of the URL to click on the selection panel and make the only possible choice.
Once that is done in the Canonical_Date.AutoCalendar.YearMonth I get the correct result.
I'm not sure I understood the possible solution in your answer, the one with the theory behind YearMonth .
Maybe I can force Autocalendar to make selection itself, based on possible selections of the Canonical_Date selected values.