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: TPO659
name: 16/1986
tree-preservation-order: undefined
16/1986
tree-preservation-zone-type: group
geometry: MULTIPOLYGON (((0.667863 51.276632,0.667898 51.276632,0.667935 51.276643,0.668101 51.276734,0.668259 51.276809,0.668431 51.276922,0.668604 51.277023,0.668836 51.277112,0.668918 51.277167,0.669032 51.277225,0.669117 51.277284,0.669159 51.277297,0.669281 51.277360,0.669314 51.277394,0.669378 51.277432,0.669647 51.277542,0.669789 51.277620,0.669864 51.277677,0.670020 51.277754,0.670062 51.277783,0.670078 51.277811,0.670075 51.277829,0.670057 51.277847,0.670002 51.277875,0.669904 51.277857,0.669809 51.277822,0.669721 51.277781,0.669578 51.277693,0.669479 51.277650,0.669219 51.277510,0.669162 51.277490,0.668937 51.277364,0.668734 51.277278,0.668629 51.277222,0.668482 51.277163,0.668123 51.276979,0.668025 51.276916,0.667733 51.276756,0.667707 51.276726,0.667711 51.276714,0.667758 51.276690,0.667804 51.276652,0.667863 51.276632)))
point: POINT (0.668844 51.277232)
notes: Maidstone Borough Council Tree Preservation Order No 16 of 1986 under Section 60 of the Town and Country Planning Act 1971 Group of Trees - G2 comprising of 9 Lime, 10 Cherry,
organisation
entry-date: 1986-08-13
start-date: 1986-07-19
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.