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: TPO977
name: 7/1990
tree-preservation-order: undefined
7/1990
tree-preservation-zone-type: woodland
geometry: MULTIPOLYGON (((0.660436 51.254905,0.660492 51.254990,0.661095 51.255798,0.661878 51.256825,0.662073 51.257098,0.662980 51.258302,0.662970 51.258333,0.662925 51.258339,0.662886 51.258331,0.662848 51.258308,0.661462 51.256469,0.661043 51.255899,0.660288 51.254911,0.659925 51.254404,0.659484 51.253845,0.659570 51.253750,0.660436 51.254905)))
point: POINT (0.661212 51.256038)
notes: The Maidstone Borough Council Tree Preservation Order No 7 of 1990 under Section 60 of the Town and Country Planning Act 1971 Woodlands - W7 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.