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: ZZZZZWESRW848
name: Bucks County Council (Eton Rural District) Tree Preservation Order No.12 - 1951 made by Bucks. Count
tree-preservation-order: undefined
TPO/BCC/1951/12
tree-preservation-zone-type
geometry: MULTIPOLYGON (((-0.609294 51.541430,-0.609244 51.541411,-0.609191 51.541455,-0.609010 51.541635,-0.608984 51.541663,-0.608937 51.541736,-0.608887 51.541820,-0.608876 51.541848,-0.608828 51.541947,-0.608706 51.542170,-0.608642 51.542305,-0.608609 51.542384,-0.608594 51.542428,-0.608560 51.542542,-0.608512 51.542734,-0.608487 51.542878,-0.608470 51.542961,-0.608461 51.543018,-0.608461 51.543071,-0.608466 51.543133,-0.608487 51.543142,-0.608571 51.543136,-0.608631 51.543095,-0.608677 51.543040,-0.608702 51.542980,-0.608720 51.542848,-0.608775 51.542643,-0.608843 51.542400,-0.608899 51.542274,-0.609096 51.541924,-0.609154 51.541864,-0.609352 51.541883,-0.609381 51.541884,-0.609409 51.541882,-0.609445 51.541874,-0.609460 51.541864,-0.609487 51.541828,-0.609518 51.541755,-0.609561 51.541622,-0.609561 51.541618,-0.609566 51.541607,-0.609572 51.541595,-0.609610 51.541552,-0.609624 51.541539,-0.609371 51.541458,-0.609294 51.541430)))
point: POINT (-0.608956 51.542138)
notes
entry-date: 2017-07-04
start-date: 2017-07-04
end-date

Your data is missing a tree-preservation-order.

The Tree preservation zone guidance explains how to fix the issue:

The reference for the tree preservation order that covers this zone.