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: 515
name: THE BIRMINGHAM (SITE OF SALISBURY TRANSMISSION LTD., OLD BROMFORD LANE, WARD END) TPO 1987
tree-preservation-order: undefined
TPO 515
tree-preservation-zone-type: area
geometry: MULTIPOLYGON (((-1.818585 52.498385,-1.820394 52.499003,-1.821561 52.497833,-1.822034 52.497396,-1.821867 52.497325,-1.821585 52.497184,-1.821523 52.497185,-1.821402 52.497106,-1.821417 52.497089,-1.821402 52.497058,-1.821306 52.496963,-1.821146 52.496780,-1.820659 52.497143,-1.819548 52.496587,-1.818585 52.498385)))
point: POINT (-1.820197 52.497801)
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.