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: TPO776
name: 8/1971
tree-preservation-order: undefined
8/1971
tree-preservation-zone-type: woodland
geometry: MULTIPOLYGON (((0.594656 51.321716,0.594922 51.321827,0.595205 51.321962,0.595851 51.322308,0.596062 51.322432,0.596278 51.322575,0.596991 51.323001,0.596897 51.323077,0.596880 51.323104,0.596889 51.323123,0.596950 51.323158,0.596386 51.323557,0.596422 51.323678,0.596607 51.323770,0.596735 51.323877,0.596282 51.324133,0.596042 51.324026,0.595905 51.323953,0.595583 51.323716,0.595185 51.323398,0.595040 51.323309,0.594398 51.322963,0.594100 51.322767,0.593807 51.322539,0.593670 51.322371,0.593634 51.322312,0.593624 51.322179,0.593586 51.322030,0.593542 51.321871,0.593490 51.321751,0.593427 51.321657,0.593312 51.321524,0.593250 51.321476,0.593127 51.321400,0.593109 51.321321,0.593107 51.321281,0.593115 51.321247,0.594037 51.321496,0.594228 51.321554,0.594433 51.321622,0.594656 51.321716)))
point: POINT (0.595159 51.322675)
notes: County of Kent (Hollingbourne Rural District) Tree Preservation Order No 8 of 1971 confirmed 23th November, 19 Woodlands - W2 Oak and Beech standards over Sweet Chestnut, Hornbeam, Ash and Birch
organisation
entry-date: 1971-07-09
start-date: 1971-06-25
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.