Documentation of statistics: Net Price Index
From January 2001, the only difference between the national index of net retail prices and the HICP is apart from the price concept the coverage of goods and services, as owner-occupied dwellings is only recorded in the index of net retail prices and not in the HICP.
https://www.dst.dk/en/Statistik/dokumentation/documentationofstatistics/net-price-index
Documentation of statistics