Because when the marriage registration documents, as Thailand is Thailand (we want to remove the data to fill in the request that the Office of the county or district marriage registration procedures).
When the marriage registration documents must be registered as Thailand is Thailand. (We need this information to fill out an application at the district office or at the district marriage registration).
When the marriage will write English documents are Thai. We need to get that information (to fill in the application at the district office or district in marriage).