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: TPO987
name: 7/1990
tree-preservation-order: undefined
7/1990
tree-preservation-zone-type: woodland
geometry: MULTIPOLYGON (((0.653088 51.260936,0.651169 51.260366,0.650266 51.260121,0.649585 51.259916,0.649468 51.259872,0.649003 51.259751,0.648689 51.259626,0.648325 51.259507,0.646787 51.259231,0.645931 51.259098,0.646025 51.259012,0.646024 51.259026,0.646035 51.259037,0.646526 51.259126,0.646878 51.259181,0.646904 51.259123,0.648444 51.259418,0.648746 51.259514,0.648843 51.259566,0.648943 51.259608,0.649468 51.259762,0.650177 51.259984,0.650591 51.260096,0.653368 51.260909,0.653289 51.260950,0.653217 51.261003,0.653088 51.260936)))
point: POINT (0.649709 51.259916)
notes: The Maidstone Borough Council Tree Preservation Order No 7 of 1990 under Section 60 of the Town and Country Planning Act 1971 Woodlands - W4 mixed Deciduous consisting mainly of
organisation
entry-date: 1990-10-05
start-date: 1990-10-02
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.