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: TPO692
name: 16/1986
tree-preservation-order: undefined
16/1986
tree-preservation-zone-type: group
geometry: MULTIPOLYGON (((0.662027 51.287403,0.662061 51.287440,0.662057 51.287492,0.661815 51.287565,0.661676 51.287623,0.661524 51.287658,0.660808 51.287939,0.660615 51.287993,0.660465 51.288056,0.660346 51.288088,0.660196 51.288141,0.660027 51.288183,0.659860 51.288241,0.659659 51.288291,0.659489 51.288357,0.659310 51.288411,0.659071 51.288460,0.658901 51.288511,0.658793 51.288524,0.658749 51.288505,0.658744 51.288476,0.658762 51.288438,0.658877 51.288368,0.658940 51.288298,0.659046 51.288244,0.659147 51.288218,0.659282 51.288212,0.659354 51.288180,0.659537 51.288148,0.659922 51.288028,0.660327 51.287918,0.660806 51.287765,0.660899 51.287751,0.661000 51.287688,0.661083 51.287687,0.661194 51.287652,0.661290 51.287611,0.661409 51.287584,0.661678 51.287474,0.661884 51.287416,0.662027 51.287403)))
point: POINT (0.660267 51.288007)
notes: Maidstone Borough Council Tree Preservation Order No 16 of 1986 under Section 60 of the Town and Country Planning Act 1971 Group of Trees - G9 comprising 2 Ash, 63 Poplars
organisation
entry-date: 1986-08-13
start-date: 1986-07-19
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.