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: TPO380
name: 20/1987
tree-preservation-order: undefined
20/1987
tree-preservation-zone-type: group
geometry: MULTIPOLYGON (((0.664837 51.274457,0.665021 51.274563,0.665185 51.274725,0.665245 51.274704,0.665364 51.274759,0.665480 51.274696,0.665725 51.274542,0.665771 51.274523,0.665809 51.274522,0.665942 51.274617,0.665954 51.274642,0.665925 51.274675,0.665887 51.274698,0.665599 51.274835,0.665399 51.274949,0.665345 51.274958,0.665002 51.274769,0.664888 51.274664,0.664675 51.274519,0.664688 51.274505,0.664837 51.274457)))
point: POINT (0.665347 51.274708)
notes: The Maidstone Borough Council Tree Preservation Order No 20 of 1987 under Section 60 of the Town and Country Planning Act 1971 Group of Trees - G18 comprising 1 Sycamore, 3 Ash,
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.