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: TPO703
name: 16/1976
tree-preservation-order: undefined
16/1976
tree-preservation-zone-type: group
geometry: MULTIPOLYGON (((0.593151 51.294129,0.593220 51.294137,0.593276 51.294166,0.593328 51.294289,0.593334 51.294326,0.593329 51.294350,0.593305 51.294363,0.593174 51.294373,0.593098 51.294315,0.593063 51.294305,0.593034 51.294226,0.593046 51.294182,0.593087 51.294145,0.593151 51.294129)))
point: POINT (0.593186 51.294252)
notes: Maidstone Borough Council Tree Preservation Order No. 16 of 1976 under Section 60 of the Town and Country Planning Act 1971. Group of Trees - G1 Ash (Fraxinus excelsior)
organisation
entry-date: 1976-07-12
start-date: 1976-07-02
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.