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: ZZZZDVESXE746
name: The Bucks County Council (Amersham Rural District) Tree Preservation Order No 8 - 1949 Confirmed by
tree-preservation-order: undefined
TPO/1949/008
tree-preservation-zone-type
geometry: MULTIPOLYGON (((-0.722706 51.718452,-0.723008 51.718342,-0.723015 51.718303,-0.723015 51.718293,-0.723013 51.718291,-0.723013 51.718287,-0.722966 51.718151,-0.722929 51.718071,-0.722882 51.717987,-0.722728 51.717766,-0.722668 51.717685,-0.722597 51.717598,-0.722515 51.717500,-0.722384 51.717353,-0.722324 51.717280,-0.722278 51.717212,-0.722224 51.717111,-0.722210 51.717082,-0.722174 51.717032,-0.722109 51.716946,-0.721865 51.716653,-0.721716 51.716701,-0.721631 51.716737,-0.721492 51.716803,-0.721722 51.717121,-0.721840 51.717308,-0.722202 51.717929,-0.722492 51.718384,-0.722601 51.718490,-0.722706 51.718452)))
point: POINT (-0.722293 51.717605)
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.