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: TPO783
name: 13/1986
tree-preservation-order: undefined
13/1986
tree-preservation-zone-type: woodland
geometry: MULTIPOLYGON (((0.660093 51.269342,0.659203 51.268897,0.658966 51.268799,0.658315 51.269255,0.657979 51.269113,0.658146 51.268974,0.658538 51.268730,0.658973 51.268429,0.659319 51.268143,0.659748 51.267825,0.660121 51.267582,0.660226 51.267545,0.660340 51.267529,0.660429 51.267541,0.660478 51.267555,0.660666 51.267637,0.660909 51.267779,0.660993 51.267837,0.661124 51.267946,0.661567 51.268232,0.661476 51.268317,0.661393 51.268380,0.661073 51.268611,0.660841 51.268765,0.660728 51.268878,0.660624 51.268838,0.660561 51.268833,0.660496 51.268850,0.660436 51.268883,0.660280 51.268990,0.660094 51.269148,0.660045 51.269200,0.660041 51.269252,0.660050 51.269299,0.660093 51.269342)))
point: POINT (0.659994 51.268431)
notes: Maidstone Borough Council Tree Preservation Order No 13 of 1986 under Section 60 of the Town and Country Planning Act 1971 Woodlands - W10 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.