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: TPO720
name: 18/1986
tree-preservation-order: undefined
18/1986
tree-preservation-zone-type: woodland
geometry: MULTIPOLYGON (((0.641400 51.294487,0.641653 51.294518,0.642046 51.294621,0.642276 51.294690,0.642436 51.294726,0.642641 51.294753,0.642811 51.294753,0.642779 51.294807,0.642779 51.294824,0.642821 51.295008,0.642882 51.295120,0.642890 51.295266,0.642882 51.295290,0.642890 51.295343,0.642882 51.295371,0.642781 51.295492,0.642740 51.295521,0.642607 51.295535,0.641946 51.295674,0.641891 51.295671,0.641854 51.295654,0.641773 51.295582,0.641716 51.295496,0.641721 51.295474,0.641761 51.295447,0.641750 51.295341,0.641668 51.295120,0.641436 51.294621,0.641404 51.294527,0.641395 51.294485,0.641400 51.294487)))
point: POINT (0.642176 51.295092)
notes: The Maidstone Borough Council Tree Preservation Order No 18 of 1986 under Section 60 of the Town and Country Planning Act 1971 Woodlands - W4 Mixed Conifer & Deciduous trees
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.