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: ZZZZDVESXE792
name: Amersham Rural District Council Interim Tree Preservation Order No 28 of 1947 [part deleted by TPO/
tree-preservation-order: undefined
TPO/1947/028
tree-preservation-zone-type
geometry: MULTIPOLYGON (((-0.592093 51.751596,-0.592210 51.751578,-0.591865 51.751033,-0.591284 51.750026,-0.591016 51.749330,-0.590562 51.749675,-0.589974 51.750102,-0.589493 51.750496,-0.589373 51.750582,-0.588746 51.750953,-0.588590 51.750808,-0.588528 51.750728,-0.588469 51.750630,-0.588429 51.750514,-0.587301 51.751084,-0.587247 51.751224,-0.587197 51.751316,-0.586981 51.751449,-0.586799 51.751817,-0.586750 51.751992,-0.587226 51.751951,-0.587358 51.751955,-0.587657 51.751943,-0.587995 51.751944,-0.588395 51.751919,-0.588824 51.751869,-0.589327 51.751844,-0.589448 51.751848,-0.589852 51.751814,-0.590170 51.751815,-0.590531 51.751774,-0.590681 51.751777,-0.590813 51.751742,-0.590969 51.751733,-0.591271 51.751695,-0.591575 51.751669,-0.592093 51.751596)))
point: POINT (-0.589722 51.751057)
notes
organisation
entry-date: 2010-02-18
start-date: 2010-02-18
end-date

Your dataset is missing the tree-preservation-order column.

The Tree preservation zone guidance explains how to fix the issue:

The reference for the tree preservation order that covers this zone.