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: TPO411
name: 20/1987
tree-preservation-order: undefined
20/1987
tree-preservation-zone-type: group
geometry: MULTIPOLYGON (((0.667931 51.276633,0.668666 51.277039,0.668788 51.277094,0.668999 51.277208,0.669612 51.277510,0.670024 51.277746,0.670091 51.277808,0.670024 51.277875,0.669989 51.277881,0.669861 51.277830,0.669577 51.277691,0.669383 51.277580,0.668869 51.277308,0.668696 51.277248,0.668485 51.277129,0.667735 51.276734,0.667758 51.276706,0.667818 51.276668,0.667884 51.276639,0.667931 51.276633)))
point: POINT (0.668904 51.277246)
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 - G19 comprising of 9 Lime, 10 Cherry,
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.