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: TPO517
name: 20/1987
tree-preservation-order: undefined
20/1987
tree-preservation-zone-type: woodland
geometry: MULTIPOLYGON (((0.673883 51.283699,0.673608 51.283550,0.672928 51.283113,0.672721 51.282955,0.672781 51.282929,0.672896 51.282841,0.673061 51.282732,0.673115 51.282671,0.673276 51.282522,0.673406 51.282426,0.673441 51.282434,0.673498 51.282477,0.673648 51.282631,0.673740 51.282698,0.674072 51.282980,0.674224 51.283121,0.674397 51.283262,0.674162 51.283450,0.673869 51.283642,0.673883 51.283699)))
point: POINT (0.673574 51.283071)
notes: The Maidstone Borough Council Tree Preservation Order No 20 of 1987 under Section 60 of the Town and Country Planning Act 1971 Woodlands - W7 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.