The application cross reference record (type 23 entries in csv) provides a set of 20 character references relating to a property. A number of basic sources are identified in the NLPG documentation, but locally generated codes do not necessarily follow these rules.
The recommended format is CUSTODIAN_CODE followed by a two letter identifier from the following table.
|ND||Non Domestic Rates|
Where a local variation is identified against one of the above codes, the correct code type will be used internally, but an amount of additional data is already being included in addition to the limited list, some of which do not require the inclusion of a CUSTODIAN_CODE as they are nationally recognised. A full list of identified will be maintained here