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: ZZZZDTESXE827
name: The Chiltern District Council (Land adjacent to Bloomfield Cottages, Bellingdon, Chesham HP5 2XR) Tr
tree-preservation-order: undefined
TPO/2007/008
tree-preservation-zone-type
geometry: MULTIPOLYGON (((-0.632603 51.737947,-0.632982 51.737697,-0.633532 51.737349,-0.633324 51.737214,-0.633219 51.737281,-0.633191 51.737291,-0.633173 51.737295,-0.633154 51.737295,-0.633128 51.737292,-0.633100 51.737282,-0.633075 51.737270,-0.633054 51.737255,-0.633037 51.737238,-0.633031 51.737228,-0.633029 51.737220,-0.633029 51.737202,-0.633031 51.737193,-0.633040 51.737176,-0.633047 51.737168,-0.633057 51.737161,-0.632782 51.737054,-0.632562 51.737192,-0.632372 51.737315,-0.632198 51.737412,-0.632068 51.737480,-0.632012 51.737505,-0.631927 51.737539,-0.631969 51.737574,-0.632000 51.737595,-0.632603 51.737947)))
point: POINT (-0.632714 51.737489)
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.