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: TPO352
name: 6/1983
tree-preservation-order: undefined
6/1983
tree-preservation-zone-type: woodland
geometry: MULTIPOLYGON (((0.609483 51.274435,0.609493 51.274344,0.609484 51.274306,0.609411 51.274214,0.609270 51.274075,0.609247 51.274022,0.609248 51.273996,0.609256 51.273968,0.609283 51.273930,0.609352 51.273880,0.609612 51.273824,0.609606 51.273785,0.609550 51.273708,0.609702 51.273701,0.609985 51.273738,0.610121 51.273807,0.610226 51.273905,0.610253 51.273949,0.610248 51.274020,0.610184 51.274088,0.610142 51.274148,0.610118 51.274208,0.610075 51.274240,0.609816 51.274345,0.609728 51.274361,0.609483 51.274435)))
point: POINT (0.609755 51.274038)
notes: Maidstone Borough Council Tree Preservation Order No 6 of 1983 as varied by the Maidstone Borough Council Tree Preservation Order No.18 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.