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: TPO636
name: 8/1971
tree-preservation-order: undefined
8/1971
tree-preservation-zone-type: woodland
geometry: MULTIPOLYGON (((0.593115 51.321247,0.593118 51.321182,0.593101 51.321138,0.593020 51.321025,0.592950 51.320962,0.592817 51.320889,0.592896 51.320866,0.593136 51.320824,0.593257 51.320772,0.593345 51.320719,0.593436 51.320639,0.593535 51.320521,0.593624 51.320358,0.593749 51.320193,0.593800 51.320157,0.593878 51.320130,0.594049 51.320095,0.594423 51.320048,0.594953 51.320023,0.595445 51.320377,0.595728 51.320514,0.595842 51.320539,0.595613 51.320736,0.595444 51.320946,0.594994 51.321411,0.594861 51.321574,0.594685 51.321728,0.594433 51.321622,0.594228 51.321554,0.594037 51.321496,0.593115 51.321247)))
point: POINT (0.594387 51.320815)
notes: County of Kent (Hollingbourne Rural District) Tree Preservation Order No 8 of 1971 confirmed 23th November, 19 Woodlands - W3 Oak, Ash, Beech and Field Maple standards over Sweet Chestnut, Hornbeam
organisation
entry-date: 1971-07-09
start-date: 1971-06-25
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.