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: ZZZZDVESXE118
name: The Chiltern District Council (trees standing on land off Holloway Lane, Chesham Bois) Tree Preserva
tree-preservation-order: undefined
TPO/1984/006
tree-preservation-zone-type
geometry: MULTIPOLYGON (((-0.595280 51.687512,-0.595388 51.687455,-0.595416 51.687443,-0.595459 51.687421,-0.595590 51.687337,-0.595606 51.687331,-0.595778 51.687245,-0.595789 51.687241,-0.595882 51.687192,-0.595882 51.687181,-0.595873 51.687171,-0.595856 51.687164,-0.595833 51.687165,-0.595798 51.687178,-0.595700 51.687232,-0.595533 51.687318,-0.595493 51.687333,-0.595198 51.687486,-0.594993 51.687597,-0.594661 51.687737,-0.594655 51.687742,-0.594651 51.687749,-0.594648 51.687760,-0.594649 51.687768,-0.594656 51.687774,-0.594667 51.687776,-0.594680 51.687776,-0.594713 51.687766,-0.594757 51.687749,-0.594775 51.687744,-0.594841 51.687717,-0.594855 51.687713,-0.595144 51.687579,-0.595280 51.687512)))
point: POINT (-0.595266 51.687479)
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.