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: 481
name: THE BIRMINGHAM (LAND AT LYNDON CLOSE, HANDSWORTH) TPO 1986
tree-preservation-order: undefined
TPO 481
tree-preservation-zone-type: area
geometry: MULTIPOLYGON (((-1.911863 52.514640,-1.911590 52.514724,-1.911545 52.514723,-1.911237 52.514820,-1.911559 52.515125,-1.912350 52.514848,-1.912344 52.514840,-1.912419 52.514814,-1.912184 52.514534,-1.911863 52.514640)))
point: POINT (-1.91184 52.514829)
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.