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: 621
name: THE BIRMINGHAM (FORMER ALLOTMENT SITE, REAR OF BEAUMONT ROAD, KINGS NORTON) TPO 1993
tree-preservation-order: undefined
TPO 621
tree-preservation-zone-type: area
geometry: MULTIPOLYGON (((-1.934990 52.422772,-1.934891 52.422621,-1.935143 52.422537,-1.935248 52.422496,-1.935249 52.422488,-1.935667 52.422334,-1.936487 52.422130,-1.937238 52.422034,-1.937168 52.421908,-1.933659 52.422138,-1.933736 52.422855,-1.933768 52.423079,-1.933898 52.423041,-1.934990 52.422772)))
point: POINT (-1.934867 52.422381)
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.