Tree preservation zone

There is a problem

1000 entries with tree-preservation-order field must match the reference field in the tree preservation order dataset

reference: TPO574
name: 2/1983
tree-preservation-order: undefined
2/1983
tree-preservation-zone-type: group
geometry: MULTIPOLYGON (((0.635324 51.280904,0.635439 51.280909,0.635510 51.280939,0.635580 51.280992,0.635595 51.281016,0.635588 51.281042,0.635566 51.281072,0.635472 51.281148,0.635363 51.281213,0.635346 51.281231,0.635321 51.281281,0.635283 51.281308,0.635222 51.281336,0.635098 51.281353,0.635055 51.281348,0.635008 51.281334,0.634928 51.281286,0.634911 51.281264,0.634900 51.281223,0.634913 51.281160,0.634964 51.281125,0.635011 51.281109,0.635029 51.281095,0.635043 51.281074,0.635045 51.281046,0.635060 51.281015,0.635100 51.280965,0.635167 51.280928,0.635324 51.280904)))
point: POINT (0.635233 51.28112)
notes: The Maidstone Borough Council Tree Preservation Order No.2, 1983 under provisions of Section 60 & 61 of the Town and Country Planning Act 1971 Group of Trees - G2 comprising 4 Oak (Quercus robur)
organisation
entry-date: 1983-02-22
start-date: 1983-02-21
end-date

Your dataset is missing the tree-preservation-order column.

The Tree preservation zone guidance explains how to fix the issue:

The reference for the tree preservation order that covers this zone.