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: 789
name: THE BIRMINGHAM (LAND BETWEEN OAK TREE LANE AND LANGLEYS ROAD, SELLY OAK) TPO 1998
tree-preservation-order: undefined
TPO 789
tree-preservation-zone-type: area
geometry: MULTIPOLYGON (((-1.941132 52.437997,-1.940991 52.435401,-1.940394 52.435416,-1.940394 52.435367,-1.939850 52.435363,-1.939801 52.435667,-1.939780 52.435900,-1.939773 52.436148,-1.939783 52.436376,-1.939819 52.436780,-1.939854 52.437355,-1.939863 52.437646,-1.939860 52.437996,-1.940466 52.437973,-1.940467 52.438010,-1.941132 52.437997)))
point: POINT (-1.94044 52.436701)
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.