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: ZZZZDVESXE790
name: The Rural District Council of Amersham Interim Tree Preservation Order [No 2 of 1948]
tree-preservation-order: undefined
TPO/1948/002
tree-preservation-zone-type
geometry: MULTIPOLYGON (((-0.592521 51.662658,-0.592450 51.662584,-0.592377 51.662464,-0.592327 51.662437,-0.592184 51.662436,-0.592036 51.662456,-0.591921 51.662636,-0.591302 51.663367,-0.590695 51.664143,-0.590457 51.664391,-0.590326 51.664603,-0.590311 51.664685,-0.589735 51.665046,-0.589582 51.665126,-0.589333 51.665228,-0.589000 51.665407,-0.589099 51.665502,-0.589172 51.665547,-0.589201 51.665545,-0.589279 51.665518,-0.590361 51.665080,-0.590760 51.664911,-0.590953 51.664839,-0.591136 51.664754,-0.591226 51.664688,-0.591350 51.664573,-0.591651 51.664248,-0.591756 51.664153,-0.592011 51.664218,-0.592005 51.664171,-0.592010 51.664136,-0.592090 51.664047,-0.592212 51.663954,-0.592242 51.663919,-0.592294 51.663820,-0.592339 51.663684,-0.592344 51.663628,-0.592334 51.663595,-0.592296 51.663551,-0.592215 51.663506,-0.592211 51.663495,-0.592224 51.663468,-0.592299 51.663343,-0.592613 51.663018,-0.592707 51.662911,-0.592765 51.662781,-0.592771 51.662761,-0.592521 51.662658)))
point: POINT (-0.591314 51.663933)
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.