7.2.1
If the Addressable Object is approved through the official SNN process, then the Official Address Field must be OFFICIAL_FLAG = “Y”.
7.2.2
If a new Addressable Object is entered for an Official Address Object which has been through the SNN process, that Object should only have a current LPI Record which is the Approved Preferred LPI (or a separate Approved Preferred LPI if the Welsh Language is used). However, if a Record already exists and there is irresolvable conflict between the manners in which the Object is described, then the use of an Alternative LPI provides a mechanism for ensuring consistent textual reference to a BLPU. For example, if a flat has not been through the official SNN process and is known as both “Flat 1” and “Flat A”, then an Alternative LPI Record should be created.
7.2.3
The Alternative LPI is also useful when entering Objects which are not subject to the SNN process but still require representation. This is a key element of the data structure because it enables users to locate an Object in the real world even if the Official Address is not used to describe it. It also supports the use of the UPRN to match with other datasets, if the Official Address is not always used.
7.2.4
If an Addressable Object Record exists which has not been subject to the SNN process and the geographical address differs from the Postal Address in use, then the former should be created as the Approved Preferred LPI and the latter as an Alternative LPI.