Day Name and Month Name missing when publishing to web app

Hi, 

i´ve created a Tile to show sales by day of the wook and another by Month.

i´ve created DayName and Month Name colums from "Date" Column using PI Desktop (Add Column>Date>Day>Name of Day)

It works well whent using it in Desktop but when i publish the report to the PI Web App the data of those columns is missing.

Other columns like "Month" or "DayOfWeek" work ok.

I´ve tried changing the language configuration from Spanish to English in Web app and the collation of the report in Desktop but not result.

Does anyone have experienced a similar issue? Any recomendation?

Thanks in advance and Regards,

Dani.