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: ZZZZDVESXE769
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 (((-0.597214 51.718650,-0.597392 51.718671,-0.597462 51.718694,-0.597562 51.718744,-0.597726 51.718894,-0.597727 51.718941,-0.598082 51.718844,-0.598823 51.718750,-0.599114 51.718894,-0.599166 51.718930,-0.599303 51.719104,-0.599361 51.719198,-0.599456 51.719264,-0.599588 51.719127,-0.599552 51.719087,-0.599484 51.719046,-0.599420 51.718968,-0.599288 51.718864,-0.599204 51.718816,-0.598924 51.718687,-0.599059 51.718592,-0.599105 51.718516,-0.599128 51.718165,-0.599183 51.717970,-0.598363 51.717849,-0.598276 51.717819,-0.598147 51.717735,-0.598001 51.717852,-0.597875 51.718008,-0.597733 51.718146,-0.597618 51.718207,-0.597222 51.718386,-0.597081 51.718445,-0.596906 51.718504,-0.597139 51.718628,-0.597214 51.718650)))
point: POINT (-0.598295 51.718414)
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.