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: TPO500
name: 4/1983
tree-preservation-order: undefined
4/1983
tree-preservation-zone-type: woodland
geometry: MULTIPOLYGON (((0.622877 51.276298,0.622284 51.275366,0.622154 51.275372,0.621841 51.275419,0.621539 51.275446,0.621509 51.275441,0.621472 51.275418,0.621432 51.275415,0.621436 51.275381,0.621379 51.275336,0.621403 51.275279,0.621294 51.275138,0.621241 51.275047,0.621217 51.274980,0.621149 51.274852,0.621099 51.274783,0.621033 51.274717,0.621011 51.274684,0.620970 51.274599,0.620881 51.274358,0.620755 51.274183,0.621059 51.274077,0.622615 51.274065,0.622663 51.274367,0.622659 51.274577,0.622731 51.274761,0.622807 51.274921,0.622846 51.275063,0.622858 51.275179,0.622937 51.275347,0.623134 51.275343,0.623225 51.275321,0.623318 51.275321,0.623340 51.275332,0.623380 51.275370,0.623437 51.275453,0.623444 51.275490,0.623506 51.275598,0.623613 51.275700,0.623717 51.275841,0.623818 51.275948,0.622877 51.276298)))
point: POINT (0.622224 51.275004)
notes: Maidstone Borough Council Tree Preservation Order No 4 of 1983 as varied by the Maidstone Borough Council Tree Preservation Order No.16 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.