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: ZZZZDVESXE773
name: The Urban District of Chesham Interim Preservation Order No 1 Approved by Minister of Town and Count
tree-preservation-order: undefined
TPO/1948/077
tree-preservation-zone-type
geometry: MULTIPOLYGON (((-0.625212 51.711570,-0.625921 51.711158,-0.626004 51.711088,-0.626174 51.710978,-0.626280 51.710917,-0.626408 51.710849,-0.627145 51.710430,-0.627784 51.710165,-0.628036 51.710048,-0.627994 51.710000,-0.627677 51.710115,-0.627069 51.710382,-0.627081 51.710390,-0.626936 51.710478,-0.626788 51.710558,-0.626410 51.710780,-0.626248 51.710873,-0.626052 51.710989,-0.625918 51.711071,-0.625825 51.711125,-0.625830 51.711125,-0.625736 51.711184,-0.625439 51.711377,-0.625190 51.711534,-0.625119 51.711576,-0.625128 51.711582,-0.625149 51.711590,-0.625171 51.711593,-0.625212 51.711570)))
point: POINT (-0.626663 51.710698)
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.