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: ZZZZDVESXE717
name: The Bucks County Council (Amersham Rural District) Tree Preservation Order No 11 - 1951 Confirmed by
tree-preservation-order: undefined
TPO/1951/011
tree-preservation-zone-type
geometry: MULTIPOLYGON (((-0.617451 51.690618,-0.617497 51.690685,-0.617546 51.690719,-0.617626 51.690733,-0.617742 51.690739,-0.617832 51.690746,-0.617856 51.690746,-0.617904 51.690741,-0.617955 51.690727,-0.617971 51.690718,-0.618111 51.690606,-0.618163 51.690623,-0.618172 51.690535,-0.618280 51.690437,-0.618293 51.690420,-0.618301 51.690394,-0.618305 51.690324,-0.618305 51.690311,-0.618296 51.690272,-0.618287 51.690255,-0.618279 51.690245,-0.618268 51.690235,-0.618254 51.690224,-0.618218 51.690205,-0.618183 51.690192,-0.618152 51.690183,-0.618120 51.690176,-0.618099 51.690175,-0.618079 51.690175,-0.617884 51.690201,-0.617816 51.690220,-0.617717 51.690255,-0.617681 51.690272,-0.617584 51.690326,-0.617541 51.690352,-0.617473 51.690402,-0.617457 51.690417,-0.617418 51.690461,-0.617412 51.690471,-0.617408 51.690484,-0.617404 51.690508,-0.617440 51.690561,-0.617451 51.690618)))
point: POINT (-0.617864 51.690462)
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.