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: TPO58
name: 18/1973
tree-preservation-order: undefined
18/1973
tree-preservation-zone-type: group
geometry: MULTIPOLYGON (((0.510461 51.273962,0.510543 51.273990,0.510578 51.274014,0.510808 51.274124,0.510828 51.274137,0.510832 51.274152,0.510821 51.274163,0.510800 51.274167,0.510755 51.274163,0.510710 51.274152,0.510559 51.274085,0.510509 51.274081,0.510476 51.274092,0.510413 51.274132,0.510311 51.274212,0.510283 51.274223,0.510253 51.274222,0.510235 51.274211,0.510220 51.274185,0.510222 51.274146,0.510290 51.274083,0.510379 51.274017,0.510408 51.273980,0.510439 51.273963,0.510461 51.273962)))
point: POINT (0.510477 51.27409)
notes: Maidstone Borough Council Tree Preservation Order No. 18 of 1973 under Section 60 of the Town and Country Planning Act 1971. Group of Trees - G1 comprising 1 Holly, 4 Cupressus,
organisation
entry-date: 1973-07-25
start-date: 1973-07-25
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.