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: TPO764
name: 1/1971
tree-preservation-order: undefined
1/1971
tree-preservation-zone-type: woodland
geometry: MULTIPOLYGON (((0.515165 51.313778,0.515268 51.313657,0.515301 51.313605,0.515310 51.313494,0.515303 51.313330,0.515600 51.313240,0.515622 51.313250,0.515652 51.313315,0.515692 51.313441,0.515727 51.313487,0.518878 51.311566,0.520393 51.310632,0.520452 51.310603,0.520392 51.310566,0.520854 51.310312,0.523439 51.308821,0.524165 51.308420,0.524659 51.308881,0.524001 51.309208,0.523110 51.309588,0.522262 51.309990,0.521684 51.310269,0.521326 51.310457,0.520814 51.310710,0.518690 51.312021,0.516836 51.313153,0.516319 51.313461,0.515850 51.313785,0.515764 51.313834,0.515654 51.313871,0.515538 51.313872,0.515382 51.313842,0.515165 51.313778)))
point: POINT (0.520336 51.310901)
notes: County of Kent (Hollingbourne Rural District) Tree Preservation Order No 1, 1971. Confirmed 7/12/71. Order takes immediate effect by virtue of Section16 of Civic Amenities Act 1967.
organisation
entry-date: 1971-05-21
start-date: 1971-05-12
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.