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: TPO772
name: 8/1971
tree-preservation-order: undefined
8/1971
tree-preservation-zone-type: woodland
geometry: MULTIPOLYGON (((0.592671 51.321003,0.592577 51.321075,0.592449 51.321192,0.592231 51.321120,0.591312 51.320888,0.590985 51.320787,0.590830 51.320719,0.590741 51.320661,0.590465 51.320454,0.590346 51.320378,0.590432 51.320243,0.590431 51.320210,0.589757 51.319807,0.589470 51.319675,0.589379 51.319573,0.589295 51.319533,0.589104 51.319377,0.589117 51.319361,0.589084 51.319329,0.588999 51.319325,0.588926 51.319252,0.588779 51.319160,0.588747 51.319122,0.588738 51.319087,0.588653 51.319042,0.588583 51.318965,0.588516 51.318915,0.588440 51.318842,0.588224 51.318728,0.587471 51.318278,0.586654 51.317828,0.587146 51.317525,0.587596 51.317730,0.588066 51.317964,0.588763 51.318293,0.588927 51.318360,0.589489 51.317848,0.589696 51.317680,0.591123 51.318444,0.590691 51.318703,0.590225 51.318970,0.591280 51.319797,0.591814 51.320230,0.592240 51.320588,0.592671 51.321003)))
point: POINT (0.589894 51.319177)
notes: County of Kent (Hollingbourne Rural District) Tree Preservation Order No 8 of 1971 confirmed 23th November, 19 Woodlands - W4 Oak, Beech and Ash standards over Sweet Chestnut, Hornbeam and Ash
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.