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: TPO914
name: 7/1990
tree-preservation-order: undefined
7/1990
tree-preservation-zone-type: woodland
geometry: MULTIPOLYGON (((0.670458 51.263936,0.670591 51.263937,0.670703 51.263915,0.670961 51.263901,0.671519 51.263942,0.671475 51.264050,0.671402 51.264292,0.671375 51.264344,0.671346 51.264579,0.671516 51.264654,0.671443 51.264799,0.671347 51.264908,0.671216 51.265082,0.671145 51.265226,0.671044 51.265485,0.671039 51.265571,0.671105 51.265870,0.671081 51.266184,0.670807 51.266094,0.670640 51.266076,0.670361 51.266077,0.670107 51.266044,0.669901 51.265983,0.669441 51.265829,0.669283 51.265805,0.669133 51.265787,0.668845 51.265769,0.668291 51.265777,0.668243 51.265770,0.668136 51.265664,0.668043 51.265558,0.667907 51.265357,0.667836 51.265267,0.667741 51.265086,0.667691 51.265010,0.667476 51.264726,0.667451 51.264647,0.667433 51.264538,0.669006 51.264248,0.669325 51.264256,0.669437 51.264225,0.669784 51.264082,0.670021 51.264006,0.670289 51.263957,0.670458 51.263936)))
point: POINT (0.6697 51.264978)
notes: The Maidstone Borough Council Tree Preservation Order No 7 of 1990 under Section 60 of the Town and Country Planning Act 1971 Woodlands - W13 mixed Deciduous consisting mainly of
organisation
entry-date: 1990-10-05
start-date: 1990-10-02
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.