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: TPO680
name: 16/1986
tree-preservation-order: undefined
16/1986
tree-preservation-zone-type: woodland
geometry: MULTIPOLYGON (((0.667036 51.285068,0.666862 51.285145,0.666054 51.284352,0.666250 51.284255,0.666287 51.284247,0.666336 51.284253,0.666368 51.284403,0.666410 51.284532,0.666513 51.284690,0.666579 51.284763,0.666646 51.284822,0.666852 51.284964,0.667036 51.285068)))
point: POINT (0.666484 51.284666)
notes: Maidstone Borough Council Tree Preservation Order No 16 of 1986 under Section 60 of the Town and Country Planning Act 1971 Woodlands - W1 Mixed Deciduous trees consisting
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.