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: TPO678
name: 16/1986
tree-preservation-order: undefined
16/1986
tree-preservation-zone-type: group
geometry: MULTIPOLYGON (((0.663118 51.284355,0.662283 51.284535,0.662109 51.284444,0.661687 51.284184,0.661623 51.284129,0.661675 51.284098,0.661757 51.284162,0.662298 51.284490,0.663161 51.284291,0.663212 51.284335,0.663118 51.284355)))
point: POINT (0.662364 51.284363)
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 - G8 comprising of 3 Western Red
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.