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15.104. It is advised that a breakdown by service product of output and/or sales or turnover be derived, as well as trade variables from data sources (e.g., breakdown in FDI or FATS surveys, or for inward FATS, structural business surveys). Given the difficulty of producing a breakdown by product, for each activity, countries are encouraged to at least compile a breakdown of output or turnover into sales of goods and sales of services (excluding investment income). For trade variables, it is considered good practice to investigate possibilities for linking FATS and resident/non-resident trade in services statistics, in order to develop a breakdown.
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[1] There is also interest more generally in knowing which services activities produce goods and in what proportion.
[2] Establishing a correspondence between the two bases of classification may be useful, in particular for activities that tend to be carried out only by enterprises specialized in the activity and that generally do not engage in significant secondary activities.