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: ZZZZDVESXE678
name: The Bucks County Council (Chesham Urban District) Tree Preservation Order No 2 - 1956 Confirmed by M
tree-preservation-order: undefined
TPO/1956/002
tree-preservation-zone-type
geometry: MULTIPOLYGON (((-0.582936 51.694461,-0.583002 51.694524,-0.583158 51.694574,-0.583315 51.694548,-0.583386 51.694445,-0.583740 51.694226,-0.585267 51.693594,-0.585685 51.693389,-0.585891 51.693255,-0.586156 51.693008,-0.586458 51.692684,-0.586587 51.692470,-0.586669 51.692175,-0.586766 51.691557,-0.586850 51.691398,-0.586875 51.691315,-0.586843 51.691259,-0.586665 51.691181,-0.586649 51.691195,-0.586603 51.691272,-0.586513 51.691496,-0.586470 51.691664,-0.586408 51.692045,-0.586364 51.692203,-0.586314 51.692310,-0.586105 51.692709,-0.585988 51.692842,-0.585685 51.693092,-0.585579 51.693173,-0.585470 51.693237,-0.585131 51.693405,-0.584761 51.693538,-0.584219 51.693767,-0.584062 51.693846,-0.583505 51.694047,-0.583311 51.694131,-0.583183 51.694199,-0.583096 51.694262,-0.582980 51.694387,-0.582936 51.694461)))
point: POINT (-0.58524 51.693156)
notes
organisation
entry-date: 2010-02-18
start-date: 2010-02-18
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.