This wiki has set French as its global content language therefore property typing requires to either use Has type or the French equivalent in order to match the correct type annotation, unless you specify a page content language.
Be aware of the decimal punctuation used in Corresponds to value definitions (you may have a look at Property:Has area on how to set a page content language in order to use a different punctuation)
gross domestic product (GDP) is the market value of all officially recognized final goods and services produced within a country in a given period of time. (en)