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: TPO768
name: 1/1992
tree-preservation-order: undefined
1/1992
tree-preservation-zone-type: woodland
geometry: MULTIPOLYGON (((0.606609 51.312071,0.606671 51.312075,0.606695 51.312106,0.606705 51.312174,0.606669 51.312212,0.606626 51.312234,0.606147 51.312389,0.605878 51.312500,0.605766 51.312550,0.605600 51.312665,0.605564 51.312713,0.605549 51.312768,0.605563 51.312875,0.605580 51.312922,0.605664 51.313057,0.605730 51.313115,0.605738 51.313150,0.605707 51.313171,0.605658 51.313179,0.605521 51.313143,0.605366 51.313090,0.605133 51.312973,0.605086 51.312939,0.605021 51.312858,0.604990 51.312781,0.604997 51.312716,0.605017 51.312659,0.605144 51.312584,0.605237 51.312543,0.605479 51.312403,0.605624 51.312350,0.605749 51.312293,0.606411 51.312136,0.606609 51.312071)))
point: POINT (0.605657 51.3126)
notes: The Maidstone Borough Council Tree Preservation Order No 1 of 1992 under Section 198 of the Town and Country Planning Act 1990 Woodlands - W2 consisting mainly Oak, Hornbeam,
organisation
entry-date: 1992-02-10
start-date: 1992-02-07
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.