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: TPO660
name: 16/1986
tree-preservation-order: undefined
16/1986
tree-preservation-zone-type: group
geometry: MULTIPOLYGON (((0.659160 51.276617,0.659280 51.276613,0.659335 51.276633,0.659350 51.276653,0.659346 51.276693,0.659322 51.276719,0.659195 51.276792,0.659062 51.276892,0.658950 51.277008,0.658819 51.277111,0.658764 51.277181,0.658536 51.277386,0.658436 51.277504,0.658376 51.277554,0.658281 51.277655,0.658228 51.277723,0.658191 51.277807,0.658130 51.277857,0.658111 51.277889,0.658088 51.277959,0.658047 51.278009,0.658023 51.278074,0.658027 51.278125,0.657964 51.278334,0.657845 51.278574,0.657777 51.278663,0.657661 51.278863,0.657616 51.278955,0.657584 51.278970,0.657423 51.278935,0.657599 51.278637,0.657653 51.278527,0.657737 51.278315,0.657770 51.278177,0.657861 51.277904,0.657886 51.277854,0.657981 51.277711,0.658088 51.277595,0.658407 51.277299,0.658641 51.277042,0.658720 51.276967,0.659087 51.276663,0.659160 51.276617)))
point: POINT (0.658251 51.277732)
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 - G12 comprising of 8 Pine, 9 Beech,
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.