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: TPO247
name: 20/1987
tree-preservation-order: undefined
20/1987
tree-preservation-zone-type: group
geometry: MULTIPOLYGON (((0.672965 51.281006,0.673031 51.281026,0.673211 51.281126,0.673458 51.281315,0.673559 51.281408,0.673644 51.281443,0.673683 51.281477,0.673697 51.281508,0.673680 51.281558,0.673660 51.281574,0.673591 51.281571,0.673499 51.281533,0.673416 51.281486,0.673292 51.281395,0.673108 51.281282,0.672911 51.281103,0.672899 51.281064,0.672917 51.281029,0.672965 51.281006)))
point: POINT (0.673289 51.281294)
notes: The Maidstone Borough Council Tree Preservation Order No 20 of 1987 under Section 60 of the Town and Country Planning Act 1971 Group of Trees - G5 comprising 5 Oak, 2 Ash,
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.