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: ZZZZZUESRW739
name: Eton Rural District Council Tree Preservation Order 1947; dated 8/6/1948.
tree-preservation-order: undefined
TPO/ER/1997/21
tree-preservation-zone-type
geometry: MULTIPOLYGON (((-0.581322 51.543615,-0.581409 51.543649,-0.581677 51.543924,-0.581753 51.544023,-0.581842 51.544156,-0.581861 51.544281,-0.581847 51.544419,-0.581794 51.544575,-0.581745 51.544705,-0.581714 51.544881,-0.581663 51.544921,-0.581605 51.544951,-0.581540 51.544966,-0.581172 51.544912,-0.580708 51.545783,-0.580913 51.545827,-0.580993 51.545842,-0.581090 51.545738,-0.581256 51.545732,-0.581278 51.545733,-0.581299 51.545736,-0.581339 51.545748,-0.581385 51.545765,-0.581509 51.545819,-0.581554 51.545831,-0.581612 51.545842,-0.581702 51.545854,-0.581743 51.545855,-0.581825 51.545851,-0.581852 51.545852,-0.581955 51.545881,-0.581965 51.545882,-0.581968 51.545877,-0.581995 51.545748,-0.582030 51.545623,-0.582039 51.545585,-0.582047 51.545563,-0.582284 51.544996,-0.582437 51.544783,-0.582446 51.544767,-0.582505 51.544677,-0.582552 51.544609,-0.582609 51.544532,-0.582694 51.544430,-0.582761 51.544353,-0.582969 51.544163,-0.583039 51.544096,-0.583101 51.544040,-0.583225 51.543923,-0.583381 51.543766,-0.583029 51.543685,-0.582807 51.543625,-0.582323 51.543504,-0.582034 51.543484,-0.581835 51.543531,-0.581663 51.543537,-0.581358 51.543570,-0.581322 51.543615)))
point: POINT (-0.581994 51.544615)
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.