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: TPO389
name: 20/1987
tree-preservation-order: undefined
20/1987
tree-preservation-zone-type: woodland
geometry: MULTIPOLYGON (((0.676051 51.275414,0.675835 51.275160,0.675681 51.274940,0.675423 51.274535,0.675216 51.274126,0.675129 51.273980,0.675486 51.273709,0.675683 51.273548,0.675838 51.273410,0.675924 51.273318,0.676100 51.273245,0.676343 51.273117,0.676428 51.273163,0.676552 51.273304,0.676700 51.273483,0.676950 51.273811,0.677193 51.274191,0.677784 51.275066,0.677500 51.275128,0.677332 51.275149,0.677244 51.275168,0.676944 51.275195,0.676842 51.275215,0.676718 51.275252,0.676608 51.275254,0.676479 51.275297,0.676354 51.275328,0.676259 51.275365,0.676177 51.275376,0.676051 51.275414)))
point: POINT (0.67637 51.27436)
notes: The Maidstone Borough Council Tree Preservation Order No 20 of 1987 under Section 60 of the Town and Country Planning Act 1971 Woodlands - W14 Mixed Deciduous trees consisting
organisation
entry-date: 1987-07-14
start-date: 1987-07-09
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.