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: ZZZZDTESXE726
name: The Chiltern District Council (Land at Bennetts Cottage, Chalgrove and Naper Villa, Finch Lane, Knot
tree-preservation-order: undefined
TPO/1999/005
tree-preservation-zone-type
geometry: MULTIPOLYGON (((-0.649932 51.622657,-0.649695 51.622811,-0.649806 51.622885,-0.650163 51.623140,-0.650234 51.623188,-0.650426 51.623326,-0.650468 51.623369,-0.650546 51.623409,-0.650756 51.623561,-0.650767 51.623566,-0.650994 51.623370,-0.651040 51.623333,-0.651318 51.623135,-0.651372 51.623095,-0.651476 51.622992,-0.651508 51.622969,-0.651583 51.622926,-0.651861 51.622772,-0.651839 51.622773,-0.651817 51.622768,-0.651807 51.622762,-0.651791 51.622748,-0.651516 51.622584,-0.651271 51.622429,-0.650968 51.622224,-0.650755 51.622320,-0.650656 51.622363,-0.650606 51.622326,-0.650093 51.622558,-0.649932 51.622657)))
point: POINT (-0.650764 51.622847)
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.