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: ZZZZDUESXE725
name: The Chiltern District Council (Land at Burtons Wood, Burtons Lane, Chalfont St Giles) Tree Preservat
tree-preservation-order: undefined
TPO/1988/012
tree-preservation-zone-type
geometry: MULTIPOLYGON (((-0.553744 51.655806,-0.553571 51.655860,-0.553343 51.655943,-0.553141 51.656038,-0.552984 51.656114,-0.552886 51.656155,-0.552796 51.656190,-0.552748 51.656213,-0.552702 51.656239,-0.552654 51.656274,-0.552603 51.656318,-0.552579 51.656333,-0.552428 51.656404,-0.552327 51.656449,-0.552239 51.656483,-0.552188 51.656499,-0.552085 51.656528,-0.551910 51.656573,-0.552042 51.656708,-0.552264 51.656871,-0.552504 51.657000,-0.552786 51.657183,-0.553003 51.657349,-0.553026 51.657333,-0.553058 51.657324,-0.553136 51.657306,-0.553242 51.657289,-0.553442 51.657261,-0.553547 51.657242,-0.553669 51.657227,-0.553775 51.657209,-0.553915 51.657191,-0.554085 51.657161,-0.553725 51.656903,-0.554026 51.656754,-0.554327 51.656608,-0.554584 51.656481,-0.554553 51.656460,-0.554527 51.656436,-0.554513 51.656432,-0.554496 51.656423,-0.554358 51.656306,-0.554103 51.656109,-0.554004 51.656030,-0.553744 51.655806)))
point: POINT (-0.553296 51.656599)
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.