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: TPO46
name: 21/1975
tree-preservation-order: undefined
21/1975
tree-preservation-zone-type: woodland
geometry: MULTIPOLYGON (((0.560931 51.252427,0.560771 51.248691,0.561210 51.248621,0.562280 51.246521,0.563182 51.246484,0.561790 51.248211,0.561691 51.248456,0.561557 51.248841,0.561503 51.249339,0.561375 51.250964,0.561401 51.251763,0.561116 51.251792,0.560931 51.252427)))
point: POINT (0.561525 51.249089)
notes: Maidstone Borough Council Tree Preservation Order No 21 of 1975 under Section 60 of the Town and Country Planning Act 1971 Woodlands - W1 comprising the following species: Maple (Acer campestre), Sycamore (Acer pseudoplatanus), Hazel (Corylus avellana)
organisation
entry-date: 1975-10-08
start-date: 1975-10-03
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.