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: TPO707
name: 18/1986
tree-preservation-order: undefined
18/1986
tree-preservation-zone-type: group
geometry: MULTIPOLYGON (((0.635872 51.294340,0.635701 51.294345,0.635582 51.294335,0.635384 51.294282,0.635283 51.294267,0.635222 51.294246,0.635202 51.294230,0.635196 51.294220,0.635204 51.294182,0.635249 51.294086,0.635246 51.294034,0.635279 51.293944,0.635328 51.293845,0.635378 51.293786,0.635509 51.293704,0.635574 51.293747,0.635657 51.293829,0.635872 51.294340)))
point: POINT (0.63552 51.294073)
notes: The Maidstone Borough Council Tree Preservation Order No 18 of 1986 under Section 60 of the Town and Country Planning Act 1971 Group of Trees - G14 - 4 Ash, 4 Field Maple, 2 Oak
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.