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In each minor group of the main structure a four-digit code, consisting of the two digits of the minor group followed by the two digits '99', is reserved as a residual or 'not elsewhere classified' (nec) category. Any geographic area within the region described by a minor group, which is not separately identified in the classification, and not part of one of the separately identified countries, can be included in the residual or 'nec' category.
These five categories have, therefore, been separately identified as base-level units in the classification (the geographic entities included in these categories can be found in the numerical coding index for population statistics). It should be noted that residual categories are part of the main structure of the SACC and should not be used merely to 'dump' responses containing insufficient data to code to a separately identified category of the classification (see Supplementary Codes).
Provision exists in the code structure for the creation of additional residual categories should they become necessary. For instance, it may become necessary to identify a particular geographic area (a minor island, coral atoll, etc.) not considered as part of one of the identified base-level units of the classification. In order that the SACC remains a standard, users should not create residual categories without consulting the ABS. If users consider that an additional residual category is required they should contact the ABS which will make the required changes and issue a revision to the classification.