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: TPO650
name: 5/1983
tree-preservation-order: undefined
5/1983
tree-preservation-zone-type: woodland
geometry: MULTIPOLYGON (((0.620651 51.273637,0.620694 51.273641,0.620722 51.273664,0.620731 51.273688,0.620706 51.273709,0.620588 51.273771,0.620443 51.273822,0.620108 51.273918,0.620002 51.273941,0.619950 51.273940,0.619934 51.273930,0.619928 51.273915,0.619926 51.273901,0.619940 51.273882,0.620045 51.273834,0.620343 51.273755,0.620526 51.273672,0.620651 51.273637)))
point: POINT (0.620339 51.273795)
notes: Maidstone Borough Council Tree Preservation Order No 5 of 1983 as varied by the Maidstone Borough Council Tree Preservation Order No.17 of 1988 made under Section 60 of the Town and Country Planning Act 1971
organisation
entry-date: 1988-11-05
start-date: 1988-11-06
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.