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: TPO498
name: 6/1983
tree-preservation-order: undefined
6/1983
tree-preservation-zone-type: woodland
geometry: MULTIPOLYGON (((0.610118 51.274208,0.610582 51.274736,0.610537 51.274774,0.610417 51.274836,0.610131 51.275062,0.609988 51.275149,0.609756 51.275226,0.609600 51.275304,0.609492 51.275334,0.609293 51.275416,0.608776 51.275568,0.608662 51.275591,0.608240 51.275657,0.608082 51.275673,0.607961 51.275665,0.607843 51.275641,0.607721 51.275591,0.607347 51.275188,0.607278 51.275130,0.607316 51.275039,0.607844 51.274862,0.608006 51.274820,0.608334 51.274707,0.608786 51.274567,0.608919 51.274552,0.609493 51.274433,0.609728 51.274361,0.609816 51.274345,0.610075 51.274240,0.610118 51.274208)))
point: POINT (0.608943 51.275001)
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.