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: TPO670
name: 3/1983
tree-preservation-order: undefined
3/1983
tree-preservation-zone-type: woodland
geometry: MULTIPOLYGON (((0.626427 51.282236,0.626468 51.282237,0.626506 51.282259,0.626506 51.282278,0.626399 51.282356,0.626293 51.282414,0.626214 51.282468,0.626157 51.282519,0.626140 51.282556,0.626141 51.282603,0.626145 51.282645,0.626165 51.282685,0.626162 51.282723,0.626145 51.282750,0.626100 51.282762,0.626067 51.282753,0.626054 51.282737,0.626003 51.282562,0.625994 51.282517,0.626003 51.282491,0.626035 51.282458,0.626287 51.282316,0.626391 51.282248,0.626427 51.282236)))
point: POINT (0.62619 51.282479)
notes: Maidstone Borough Council Tree Preservation Order No 3 of 1983 as varied by the Maidstone Borough Council Tree Preservation Order No.14 of 1988 made under Section 60 of the Town and Country Planning Act 1971
organisation
entry-date: 1988-11-05
start-date: 1988-10-14
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.