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: TPO619
name: 18/1986
tree-preservation-order: undefined
18/1986
tree-preservation-zone-type: group
geometry: MULTIPOLYGON (((0.640906 51.289871,0.640971 51.289875,0.641026 51.289893,0.641051 51.289923,0.641065 51.289961,0.641044 51.289997,0.641006 51.290022,0.640867 51.290051,0.640813 51.290072,0.640763 51.290104,0.640610 51.290141,0.640437 51.290156,0.640377 51.290150,0.640335 51.290123,0.640333 51.290094,0.640348 51.290050,0.640405 51.289999,0.640454 51.289979,0.640663 51.289948,0.640731 51.289931,0.640769 51.289900,0.640828 51.289882,0.640906 51.289871)))
point: POINT (0.640695 51.290018)
notes: The Maidstone Borough Council Tree Preservation Order No 18 of 1986 under Section 60 of the Town and Country Planning Act 1971 Group of Trees - G4 - 8 Ash, 7 Oak, 2 Sweet Chestnut,
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.