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: TPO616
name: 16/1986
tree-preservation-order: undefined
16/1986
tree-preservation-zone-type: group
geometry: MULTIPOLYGON (((0.663586 51.283582,0.663480 51.283362,0.663545 51.283324,0.666269 51.283658,0.666239 51.283689,0.666199 51.283712,0.666085 51.283712,0.665840 51.283687,0.664838 51.283558,0.664187 51.283513,0.663971 51.283510,0.663871 51.283518,0.663776 51.283534,0.663586 51.283582)))
point: POINT (0.66462 51.283516)
notes: Maidstone Borough Council Tree Preservation Order No 16 of 1986 under Section 60 of the Town and Country Planning Act 1971 Group of Trees - G4 comprising of 25 Lime, 1 Plane,
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.