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: TPO234
name: 19/1987
tree-preservation-order: undefined
19/1987
tree-preservation-zone-type: woodland
geometry: MULTIPOLYGON (((0.637465 51.278159,0.637493 51.278127,0.637894 51.278312,0.638063 51.278374,0.638126 51.278412,0.638203 51.278485,0.638283 51.278532,0.638327 51.278549,0.638477 51.278592,0.638725 51.278617,0.638841 51.278657,0.638943 51.278727,0.639051 51.278834,0.639102 51.278901,0.639162 51.278955,0.639240 51.279018,0.639411 51.279133,0.639518 51.279226,0.639358 51.279199,0.639098 51.279053,0.638845 51.279002,0.638041 51.278561,0.637979 51.278539,0.637908 51.278485,0.637882 51.278444,0.637829 51.278391,0.637620 51.278284,0.637419 51.278202,0.637465 51.278159)))
point: POINT (0.638523 51.278696)
notes: The Maidstone Borough Council Tree Preservation Order No 19 of 1987 under Section 60 of the Town and Country Planning Act 1971 Woodlands - W15 Mixed Deciduous and Conifers consisting
organisation
entry-date: 1987-08-11
start-date: 1987-08-05
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.