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: 821
name: THE BIRMINGHAM (LAND ADJOINING 1518 STRATFORD ROAD, HALL GREEN) TPO 1999
tree-preservation-order: undefined
TPO 821
tree-preservation-zone-type: area
geometry: MULTIPOLYGON (((-1.834827 52.421210,-1.834599 52.421351,-1.834115 52.421672,-1.833940 52.421793,-1.833924 52.421813,-1.834196 52.421997,-1.835198 52.421431,-1.834838 52.421204,-1.834827 52.421210)))
point: POINT (-1.834553 52.421598)
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.