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: 257
name: THE BIRMINGHAM (LAND AT ST CHRISTOPHERS, HANDSWORTH WOOD) TPO 1977
tree-preservation-order: undefined
TPO 257
tree-preservation-zone-type: area
geometry: MULTIPOLYGON (((-1.926917 52.522740,-1.926805 52.522617,-1.926771 52.522533,-1.927216 52.522421,-1.927351 52.522401,-1.927435 52.522495,-1.927854 52.522310,-1.927979 52.522427,-1.927999 52.522420,-1.928015 52.522433,-1.928357 52.522304,-1.928301 52.522259,-1.928253 52.522275,-1.928039 52.522103,-1.928148 52.522003,-1.928224 52.521732,-1.928057 52.521775,-1.927625 52.521909,-1.927467 52.521940,-1.927073 52.521962,-1.926473 52.522155,-1.926537 52.522285,-1.926601 52.522360,-1.926693 52.522597,-1.926761 52.522725,-1.926839 52.522810,-1.926986 52.522774,-1.926951 52.522732,-1.926917 52.522740)))
point: POINT (-1.927393 52.5222)
notes: The shaded area represents those properties which fall within the outline of a Tree Preservation Order. To precisely identify trees protected by the Order, you can request a copy of the tree preservation order at the following link.
organisation
entry-date: 2025-11-30
start-date
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.