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: ZZZZZWESRW789
name: Bucks County Council (Eton Rural District) Tree Preservation Order No. 12 1957; dated 17/10/57; unde
tree-preservation-order: undefined
TPO/ER/1957/12
tree-preservation-zone-type
geometry: MULTIPOLYGON (((-0.650435 51.564397,-0.650450 51.564336,-0.650396 51.564125,-0.650361 51.564073,-0.650236 51.563937,-0.650041 51.563764,-0.649870 51.563579,-0.649753 51.563481,-0.649640 51.563358,-0.649177 51.563072,-0.648939 51.562860,-0.648874 51.562817,-0.648844 51.562787,-0.648740 51.562654,-0.648610 51.562467,-0.648198 51.561837,-0.648093 51.561686,-0.648069 51.561663,-0.648083 51.561634,-0.648042 51.561642,-0.648013 51.561659,-0.647893 51.561835,-0.647858 51.562016,-0.647841 51.562056,-0.647854 51.562054,-0.647836 51.562127,-0.647669 51.562672,-0.648011 51.562921,-0.648321 51.563124,-0.648470 51.563215,-0.648672 51.563320,-0.649215 51.563628,-0.650028 51.564137,-0.650406 51.564363,-0.650435 51.564397)))
point: POINT (-0.648794 51.562993)
notes
organisation
entry-date: 2017-07-04
start-date: 2017-07-04
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.