Conservation area document

There is a problem

conservation-area column must match the reference field in the conservation area dataset

reference: CA1
conservation-area: undefined
SCC Historic Environment Record
name: The Avenue
documentation-url: https://www.southampton.gov.uk/conservation-areas/
document-url: https://www.southampton.gov.uk/media/xmzeou3y/the-avenue-conservation-area-appraisal-management-plan-2013_tcm63-363391.pdf
document-type: management-plan
notes: Nos. 1 to 19 Cavendish Grove and 1 to 4 Cavendish Mews covered by the Article 4 Direction, other buildings exempt.
entry-date: 2013-01-01
start-date: 2013-01-01
end-date

Your data is missing a conservation-area.

The Conservation area document guidance explains how to fix the issue:

The reference for the conservation area this document refers to, as used in the conservation area dataset.

Example: CA1