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: TPO784
name: 13/1986
tree-preservation-order: undefined
13/1986
tree-preservation-zone-type: woodland
geometry: MULTIPOLYGON (((0.646791 51.267080,0.647241 51.267376,0.647741 51.267689,0.648473 51.268062,0.648738 51.268212,0.648891 51.268267,0.649161 51.268387,0.649415 51.268521,0.649848 51.268808,0.650104 51.269016,0.650283 51.269137,0.650591 51.269426,0.650806 51.269640,0.650700 51.269688,0.650357 51.269377,0.650234 51.269275,0.649896 51.269037,0.649676 51.268901,0.649062 51.268548,0.648577 51.268290,0.648178 51.268098,0.647950 51.267961,0.647797 51.267888,0.647639 51.267797,0.647223 51.267516,0.647113 51.267427,0.646889 51.267268,0.646609 51.267084,0.646492 51.266989,0.646532 51.266960,0.647118 51.266260,0.647172 51.266207,0.647512 51.266013,0.648055 51.265745,0.648068 51.265757,0.648002 51.265819,0.647849 51.265928,0.647654 51.266024,0.647474 51.266097,0.647311 51.266209,0.647220 51.266287,0.647134 51.266391,0.647025 51.266557,0.646926 51.266688,0.646739 51.266915,0.646643 51.266998,0.646791 51.267080)))
point: POINT (0.648454 51.267952)
notes: Maidstone Borough Council Tree Preservation Order No 13 of 1986 under Section 60 of the Town and Country Planning Act 1971 Woodlands - W4 Comprising : Mixed conifers and deciduous
organisation
entry-date: 1986-08-13
start-date: 1986-07-18
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.