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: TPO450
name: 17/1986
tree-preservation-order: undefined
17/1986
tree-preservation-zone-type: area
geometry: MULTIPOLYGON (((0.652258 51.285625,0.652203 51.285593,0.652240 51.285546,0.652435 51.285670,0.652913 51.286001,0.653111 51.286117,0.653419 51.286320,0.653793 51.286594,0.653837 51.286643,0.653572 51.286713,0.653305 51.286832,0.653117 51.286932,0.652964 51.287052,0.652836 51.287177,0.652596 51.287390,0.652491 51.287470,0.652238 51.287637,0.652106 51.287751,0.652073 51.287789,0.652015 51.287690,0.651911 51.287602,0.651876 51.287550,0.651801 51.287271,0.651787 51.287152,0.651791 51.287137,0.651877 51.287099,0.652276 51.287063,0.652622 51.286790,0.652750 51.286709,0.652730 51.286554,0.652680 51.286440,0.652584 51.286138,0.652398 51.285772,0.652322 51.285676,0.652258 51.285625)))
point: POINT (0.652729 51.286765)
notes: Maidstone Borough Council Tree Preservation Order No 17, 1986 under Section 60 of the Town and Country Planning Act 1971 dated 19th July 1986. Confirmed 8th October 1986
organisation
entry-date: 1986-08-13
start-date: 1986-07-19
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.