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: TPO951
name: 7/1990
tree-preservation-order: undefined
7/1990
tree-preservation-zone-type: group
geometry: MULTIPOLYGON (((0.657594 51.253492,0.657693 51.253495,0.657783 51.253511,0.657848 51.253538,0.657878 51.253566,0.657890 51.253594,0.657890 51.253615,0.657863 51.253675,0.657836 51.253702,0.657799 51.253715,0.657740 51.253726,0.657673 51.253725,0.657518 51.253705,0.657433 51.253676,0.657406 51.253651,0.657382 51.253601,0.657383 51.253585,0.657407 51.253543,0.657427 51.253526,0.657526 51.253498,0.657594 51.253492)))
point: POINT (0.657641 51.253608)
notes: The Maidstone Borough Council Tree Preservation Order No 7 of 1990 under Section 60 of the Town and Country Planning Act 1971 Group of Trees - G26 consisting of 7 Horse Chestnut,
organisation
entry-date: 1990-10-05
start-date: 1990-10-02
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.