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: ZZZZDVESXE523
name: The Amersham Rural District Council (Chalfont St Peter, Meadowcroft) Tree Preservation Order, 1969 C
tree-preservation-order: undefined
TPO/1969/047
tree-preservation-zone-type
geometry: MULTIPOLYGON (((-0.559405 51.603476,-0.559436 51.603398,-0.559480 51.603353,-0.559546 51.603312,-0.559648 51.603258,-0.559737 51.603230,-0.559795 51.603226,-0.559984 51.603235,-0.560041 51.603194,-0.560070 51.603178,-0.560114 51.603165,-0.560159 51.603163,-0.560173 51.603155,-0.560214 51.603141,-0.560254 51.603124,-0.560449 51.603106,-0.560475 51.603038,-0.560299 51.602819,-0.560294 51.602822,-0.560237 51.602839,-0.560194 51.602854,-0.560102 51.602892,-0.559957 51.602956,-0.559875 51.602999,-0.559727 51.603071,-0.559417 51.603228,-0.559422 51.603239,-0.559191 51.603356,-0.559405 51.603476)))
point: POINT (-0.559914 51.603116)
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.