Conservation area

There is a problem

reference: 16
name: Cranbury Place
designation-date: designation-date must be a real date
1977-09-08
document-url: https://www.southampton.gov.uk/media/flcbgkvu/cranbury-place-conservation-area-appraisal-management-plan-2013_tcm63-363335.pdf
documentation-url: https://www.southampton.gov.uk/planning/heritage/conservation-areas/cranbury-place/
geometry: MULTIPOLYGON (((-1.397636 50.915494,-1.398014 50.915460,-1.398021 50.915467,-1.398207 50.915395,-1.398242 50.915441,-1.398701 50.915304,-1.400564 50.914829,-1.400459 50.914673,-1.400916 50.914459,-1.401050 50.914356,-1.400970 50.914134,-1.400935 50.914126,-1.400911 50.914003,-1.400811 50.913862,-1.400826 50.913848,-1.400783 50.913800,-1.400630 50.913577,-1.399095 50.913622,-1.399043 50.913633,-1.399010 50.913664,-1.398719 50.913675,-1.398290 50.913673,-1.397827 50.913645,-1.397803 50.913742,-1.397570 50.913718,-1.397429 50.914319,-1.397147 50.914371,-1.397383 50.914899,-1.397629 50.914857,-1.397757 50.914929,-1.397085 50.915579,-1.397170 50.915665,-1.397228 50.915694,-1.397636 50.915494)))
point: POINT (-1.398976 50.914442)
notes: Polygons on interactive mapExtra documents are available. Best Map is shown on page 4 of the appraisal document.
organisation
entry-date: 2024-12-11
start-date: 1977-09-08
end-date

Your dataset is missing the designation-date column.

The Conservation area guidance explains how to fix the issue:

The date that the conservation area was officially designated, written in YYYY-MM-DD format.

Example:

1984-03-28

With dates, some data is better than no data, so: