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: TPO85
name: 1/1966
tree-preservation-order: undefined
1/1966
tree-preservation-zone-type: area
geometry: MULTIPOLYGON (((0.474704 51.268604,0.475078 51.268813,0.475306 51.269020,0.475385 51.269099,0.475414 51.269145,0.475286 51.269185,0.475167 51.269211,0.475093 51.269157,0.475000 51.269068,0.474990 51.269026,0.474958 51.268986,0.474801 51.268906,0.474686 51.268857,0.474665 51.268861,0.474633 51.268974,0.474583 51.268976,0.474524 51.268950,0.474365 51.268835,0.474251 51.268769,0.474187 51.268682,0.474156 51.268672,0.473997 51.268678,0.473968 51.268668,0.473933 51.268634,0.473893 51.268556,0.473836 51.268341,0.473835 51.268279,0.473843 51.268248,0.473865 51.268203,0.473904 51.268180,0.473947 51.268160,0.473990 51.268164,0.474021 51.268220,0.474704 51.268604)))
point: POINT (0.474516 51.268688)
notes: County of Kent (Maidstone Rural District) Tree Preservation Order No 1 dated 27th October 1966 Area of Trees - A1 consisting chiefly of several
organisation
entry-date: 1967-01-17
start-date: 1966-10-27
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.