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: ZZZZDVESXE744
name: The Bucks County Council (Amersham Rural District) Tree Preservation Order No 8 - 1949 Confirmed by
tree-preservation-order: undefined
TPO/1949/008
tree-preservation-zone-type
geometry: MULTIPOLYGON (((-0.737541 51.715552,-0.737953 51.715579,-0.738017 51.715634,-0.738138 51.715531,-0.738246 51.715399,-0.738327 51.715235,-0.738373 51.715096,-0.738396 51.714968,-0.738387 51.714855,-0.738329 51.714517,-0.737979 51.714538,-0.737058 51.714573,-0.735898 51.714663,-0.735423 51.714672,-0.735384 51.714681,-0.735358 51.714878,-0.735319 51.714877,-0.735296 51.714903,-0.735292 51.715019,-0.735177 51.715141,-0.735103 51.715248,-0.735064 51.715334,-0.735042 51.715450,-0.735042 51.715461,-0.735319 51.715583,-0.735411 51.715602,-0.735553 51.715617,-0.735647 51.715618,-0.735972 51.715584,-0.736296 51.715532,-0.737109 51.715530,-0.737541 51.715552)))
point: POINT (-0.736808 51.715083)
notes
organisation
entry-date: 2010-02-18
start-date: 2010-02-18
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.