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: TPO350
name: 20/1987
tree-preservation-order: undefined
20/1987
tree-preservation-zone-type: woodland
geometry: MULTIPOLYGON (((0.677650 51.272507,0.677553 51.272529,0.677507 51.272483,0.676991 51.272132,0.676940 51.272079,0.676531 51.271825,0.676590 51.271802,0.676738 51.271779,0.677409 51.271621,0.677619 51.271564,0.677873 51.271516,0.678163 51.271445,0.678408 51.271404,0.679173 51.271192,0.679576 51.271399,0.679950 51.271693,0.679919 51.271722,0.679919 51.271769,0.679925 51.271776,0.679688 51.271859,0.679437 51.271932,0.679062 51.272062,0.678878 51.272116,0.678003 51.272421,0.677829 51.272474,0.677713 51.272501,0.677650 51.272507)))
point: POINT (0.678291 51.271842)
notes: The Maidstone Borough Council Tree Preservation Order No 20 of 1987 under Section 60 of the Town and Country Planning Act 1971 Woodlands - W15 Mixed Deciduous trees consisting
organisation
entry-date: 1987-07-14
start-date: 1987-07-09
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.