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: ZZZZZWESRW958
name: Beaconsfield District Council (No.1) Tree Preservation Order 1974; dated 14/5/74 made under Ss.60 &
tree-preservation-order: undefined
TPO/BD/1974/01
tree-preservation-zone-type
geometry: MULTIPOLYGON (((-0.557928 51.524111,-0.557750 51.523995,-0.557460 51.523782,-0.556978 51.523326,-0.556677 51.523084,-0.556421 51.522912,-0.556208 51.522792,-0.555858 51.522642,-0.555632 51.522557,-0.554534 51.522225,-0.554299 51.522126,-0.554220 51.522074,-0.554153 51.522024,-0.553994 51.521862,-0.553931 51.521879,-0.553921 51.521898,-0.553921 51.521930,-0.553990 51.522007,-0.554142 51.522129,-0.554272 51.522204,-0.554424 51.522271,-0.554648 51.522351,-0.555789 51.522713,-0.556041 51.522832,-0.556483 51.523078,-0.556663 51.523206,-0.556814 51.523325,-0.557064 51.523555,-0.557121 51.523616,-0.557161 51.523661,-0.557267 51.523835,-0.557407 51.524098,-0.557461 51.524153,-0.557521 51.524192,-0.557566 51.524216,-0.557928 51.524111)))
point: POINT (-0.556274 51.523115)
notes
organisation
entry-date: 2017-07-04
start-date: 2017-07-04
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.