Was this establishment formally registered when it began operations?
Warning: these figures indicate the number of cases found in the data file. They cannot be interpreted as summary statistics of the population of interest.
Registering refers to registration with [to be defined on a country by country basis, choosing the most imp. for registration for tax purposes]. The question is designed to be answered as is without explanation of "registration". If and only if the respondent asks what formal registration means explain that it's when the establishment registered with: XXXXXXX as defined in the brackets above.