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1. Basic information collected by Member States for the harmonised indices and their sub-indices shall be representative at Member State level.

2. The information shall be obtained from statistical units as defined in Council Regulation (EEC) No 696/93 () or from other sources, provided that the comparability requirements for the harmonised indices referred to in Article 4 of this Regulation are met.

3. The statistical units that provide information on products included in the household final monetary consumption expenditure shall cooperate in the collection or provision of basic information, as required. The statistical units shall give accurate and complete basic information to the national bodies responsible for compiling the harmonised indices.

4. Upon the request of the national bodies responsible for compiling the harmonised indices, the statistical units shall provide, where available, electronic records of transactions, such as scanner data, and at the level of detail necessary in order to produce harmonised indices and to evaluate compliance with the comparability requirements and the quality of the harmonised indices.

5. The common index reference period for the harmonised indices shall be 2015. That index reference period shall be used for the full time series of all harmonised indices and their sub-indices.

6. The harmonised indices and their sub-indices shall be rescaled to a new common index reference period in the case of a major methodological change of the harmonised indices which is adopted in accordance with this Regulation, or every 10 years after the last rescaling starting from 2015. The rescaling to the new index reference period shall take effect:

(a) for monthly indices, with the index for January of the following year after the index reference period;

(b) for quarterly indices, with the index for the first quarter of the following year after the index reference period. The Commission shall adopt implementing acts establishing detailed rules on the rescaling of the harmonised indices. Those implementing acts shall be adopted in accordance with the examination procedure referred to in Article 11(2).

7. Member States shall not be required to produce and transmit:

(a) sub-indices of the HICP and of the HICP-CT accounting for less than one part in a thousand of the total expenditure;

(b) sub-indices of the OOH price index and of the HPI accounting for less than one part in a hundred of the total owner-occupier housing expenditure and total purchases of dwellings, respectively.

8. Member States shall not be required to produce the following sub-indices or parts of sub-indices of ECOICOP, either because they are not included in the household final monetary consumption expenditure or because the degree of methodological harmonisation is not yet sufficient: 02.3. Narcotics; 12.2. Prostitution; 12.5.1. Life insurance; 12.6.1. FISIM. The Commission shall be empowered to adopt delegated acts in accordance with Article 10 to modify the list set out in this paragraph in order to include games of chance in the HICP and the HICP-CT.