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: TPO584
name: 1/1975
tree-preservation-order: undefined
1/1975
tree-preservation-zone-type: area
geometry: MULTIPOLYGON (((0.602259 51.286689,0.602278 51.286670,0.602341 51.286812,0.602416 51.286930,0.602548 51.287061,0.602797 51.287343,0.602839 51.287435,0.603041 51.287632,0.603204 51.287894,0.603339 51.288056,0.603539 51.288258,0.603607 51.288365,0.603816 51.288525,0.603965 51.288704,0.604132 51.288826,0.604199 51.288907,0.604325 51.289007,0.604467 51.289105,0.604375 51.289136,0.603990 51.288817,0.603730 51.288580,0.603573 51.288450,0.603466 51.288335,0.603066 51.287875,0.602985 51.287768,0.602523 51.287214,0.602430 51.287086,0.602242 51.286859,0.602220 51.286803,0.602217 51.286742,0.602224 51.286720,0.602259 51.286689)))
point: POINT (0.603181 51.287879)
notes: County of Kent (Maidstone Borough) Tree Peservation Order No. 1 of 1975 under Section 60 of the Town and Country Planning Act 1971. Area of Trees - A5 The several Ash, Field Maple,
organisation
entry-date: 1975-10-29
start-date: 1975-09-30
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.