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: TPO721
name: 1/1969
tree-preservation-order: undefined
1/1969
tree-preservation-zone-type: woodland
geometry: MULTIPOLYGON (((0.587232 51.296995,0.587043 51.296981,0.586091 51.296958,0.585958 51.296945,0.585849 51.296920,0.585677 51.296857,0.585383 51.296736,0.585243 51.296664,0.585167 51.296634,0.585290 51.296562,0.585395 51.296519,0.585618 51.296333,0.585739 51.296249,0.585921 51.296139,0.586227 51.296182,0.586387 51.296215,0.586451 51.296248,0.586548 51.296271,0.586659 51.296330,0.586917 51.296492,0.586940 51.296531,0.587319 51.296807,0.587232 51.296995)))
point: POINT (0.586266 51.29662)
notes: County of Kent (Hollingbourne Rural District) Tree Preservation Order No 1 of 1969 relating to trees and woodla at Castle Hill Farm, Thurnham. Made on 6th January 1969 and by virtue of Sec 16 of the Civic Amenities Act 1967 came
organisation
entry-date: 1969-01-06
start-date: 1969-01-06
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.