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: TPO395
name: 6/1983
tree-preservation-order: undefined
6/1983
tree-preservation-zone-type: woodland
geometry: MULTIPOLYGON (((0.613883 51.276285,0.614683 51.276072,0.614751 51.276110,0.614873 51.276148,0.615034 51.276179,0.615448 51.276232,0.615547 51.276263,0.615687 51.276266,0.615841 51.276299,0.615855 51.276334,0.615941 51.276430,0.615985 51.276443,0.616214 51.276549,0.616475 51.276692,0.616600 51.276786,0.616659 51.276858,0.616656 51.276868,0.616589 51.276904,0.615828 51.277286,0.615409 51.277515,0.615326 51.277573,0.615099 51.277647,0.614227 51.276701,0.613883 51.276285)))
point: POINT (0.615235 51.276772)
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.