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: ZZZZDVESXE313
name: The Chiltern District Council (Land adjoining Loudhams, Burtons Lane, Little Chalfont) Tree Preserva
tree-preservation-order: undefined
TPO/1981/004
tree-preservation-zone-type
geometry: MULTIPOLYGON (((-0.561482 51.665416,-0.561496 51.665412,-0.561505 51.665405,-0.561506 51.665395,-0.561497 51.665381,-0.561469 51.665363,-0.561467 51.665343,-0.561463 51.665333,-0.561445 51.665320,-0.561439 51.665312,-0.561436 51.665302,-0.561412 51.665272,-0.561407 51.665259,-0.561403 51.665253,-0.561393 51.665249,-0.561375 51.665247,-0.561357 51.665251,-0.561348 51.665256,-0.561344 51.665262,-0.561344 51.665269,-0.561346 51.665275,-0.561367 51.665286,-0.561371 51.665291,-0.561370 51.665299,-0.561375 51.665307,-0.561377 51.665315,-0.561385 51.665325,-0.561396 51.665331,-0.561406 51.665346,-0.561407 51.665358,-0.561405 51.665374,-0.561406 51.665380,-0.561411 51.665386,-0.561432 51.665402,-0.561447 51.665410,-0.561460 51.665415,-0.561482 51.665416)))
point: POINT (-0.561425 51.665335)
notes
entry-date: 2010-02-18
start-date: 2010-02-18
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.