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: TPO997
name: 7/1990
tree-preservation-order: undefined
7/1990
tree-preservation-zone-type: woodland
geometry: MULTIPOLYGON (((0.656715 51.265141,0.656672 51.265175,0.656633 51.265159,0.656635 51.265128,0.656568 51.264965,0.656542 51.264856,0.656444 51.264673,0.656387 51.264613,0.656266 51.264523,0.656240 51.264490,0.656143 51.264426,0.656029 51.264319,0.655988 51.264294,0.656310 51.264094,0.656816 51.263761,0.656914 51.263656,0.657129 51.263461,0.657208 51.263378,0.657452 51.263186,0.657504 51.263160,0.657452 51.263058,0.657488 51.263045,0.657858 51.263045,0.658401 51.263090,0.658838 51.263195,0.659198 51.263296,0.658983 51.263302,0.658877 51.263313,0.658724 51.263348,0.658666 51.263376,0.658653 51.263434,0.658690 51.263503,0.658759 51.263554,0.658918 51.263646,0.658975 51.263814,0.659031 51.263878,0.659111 51.263933,0.659056 51.263968,0.658941 51.264013,0.658878 51.264021,0.658813 51.264011,0.658762 51.264020,0.658640 51.264049,0.658496 51.264106,0.658235 51.264128,0.658192 51.264138,0.658087 51.264182,0.657704 51.264397,0.657306 51.264722,0.657184 51.264811,0.657021 51.264959,0.656947 51.265013,0.656715 51.265141)))
point: POINT (0.657539 51.263949)
notes: The Maidstone Borough Council Tree Preservation Order No 7 of 1990 under Section 60 of the Town and Country Planning Act 1971 Woodlands - W1 mixed Deciduous consisting mainly of
organisation
entry-date: 1990-10-05
start-date: 1990-10-02
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.