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: ZZZZZRESRW949
name: The Eton Rural District Council Tree Preservation Order No.1 1964; made under S.29 of the Town and C
tree-preservation-order: undefined
TPO/ER/1964/01
tree-preservation-zone-type
geometry: MULTIPOLYGON (((-0.564437 51.590516,-0.564424 51.590372,-0.564398 51.590192,-0.564395 51.590144,-0.564407 51.590058,-0.564430 51.589724,-0.564395 51.589475,-0.564375 51.589361,-0.564074 51.589382,-0.563928 51.589395,-0.563673 51.589414,-0.563477 51.589431,-0.563455 51.589431,-0.563299 51.589442,-0.562914 51.589473,-0.562682 51.589490,-0.562715 51.589861,-0.562283 51.589971,-0.562103 51.590019,-0.562098 51.590123,-0.562425 51.590034,-0.562719 51.589958,-0.562779 51.590027,-0.562798 51.590061,-0.562806 51.590079,-0.562825 51.590142,-0.562852 51.590223,-0.562863 51.590269,-0.562951 51.590518,-0.563191 51.590534,-0.563573 51.590563,-0.563830 51.590596,-0.563874 51.590600,-0.564437 51.590516)))
point: POINT (-0.563577 51.589974)
notes
entry-date: 2017-07-04
start-date: 2017-07-04
end-date

Your data is missing a tree-preservation-order.

The Tree preservation zone guidance explains how to fix the issue:

The reference for the tree preservation order that covers this zone.