When importing a Google Sheets as a Data Source in my Zoho Analytics workspace, a "Month" column was imported as a "Text" data type, and not a "Date" data type, as shown in the image below. As I use its data in some Querys and Charts, I'd like to change it.

I found out how to change the data type opening the "Edit Design" of the table already imported in Zoho Analytics, as shown in the image below.

But when I try to change it to the "Date" data type, this message error appears.

I'd like to know what problems may occur if I change it because I tried already with the selected option of the image above, but the change doesn't finish because of some problem.