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: TPO675
name: 16/1986
tree-preservation-order: undefined
16/1986
tree-preservation-zone-type: group
geometry: MULTIPOLYGON (((0.661580 51.281797,0.661611 51.281808,0.661647 51.281834,0.661660 51.281861,0.661647 51.281919,0.661641 51.282044,0.661626 51.282105,0.661642 51.282166,0.661654 51.282310,0.661654 51.282453,0.661635 51.282675,0.661576 51.283099,0.661551 51.283149,0.661518 51.283159,0.661457 51.283162,0.661439 51.283144,0.661434 51.283126,0.661473 51.282914,0.661477 51.282745,0.661512 51.282629,0.661522 51.282449,0.661520 51.282183,0.661508 51.282067,0.661523 51.281989,0.661542 51.281936,0.661557 51.281820,0.661580 51.281797)))
point: POINT (0.661565 51.282508)
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 - G5 comprising of 1 Grand Fir,
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.