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: TPO501
name: 3/1983
tree-preservation-order: undefined
3/1983
tree-preservation-zone-type: woodland
geometry: MULTIPOLYGON (((0.639959 51.273728,0.640862 51.274468,0.640996 51.274643,0.640967 51.274733,0.640823 51.274717,0.640687 51.274643,0.640502 51.274506,0.640329 51.274317,0.640216 51.274220,0.640040 51.274047,0.639949 51.273990,0.639726 51.274154,0.639286 51.274405,0.639095 51.274547,0.638895 51.274659,0.638729 51.274817,0.638532 51.274954,0.638244 51.275231,0.637909 51.275528,0.637815 51.275642,0.637666 51.275753,0.637563 51.275874,0.637370 51.276009,0.637220 51.276138,0.637006 51.276276,0.636697 51.276499,0.636544 51.276580,0.636324 51.276458,0.636710 51.276090,0.637107 51.275835,0.637242 51.275683,0.637563 51.275435,0.637896 51.275230,0.638202 51.274984,0.638763 51.274483,0.639130 51.274223,0.639467 51.274034,0.639959 51.273728)))
point: POINT (0.638534 51.275058)
notes: Maidstone Borough Council Tree Preservation Order No 3 of 1983 as varied by the Maidstone Borough Council Tree Preservation Order No.15 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.