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: ZZZZDVESXE428
name: The Chiltern District Council (Holy Cross Convent, Chalfont St Peter) Tree Preservation Order No 3 -
tree-preservation-order: undefined
TPO/1974/003
tree-preservation-zone-type
geometry: MULTIPOLYGON (((-0.556448 51.604965,-0.556489 51.604952,-0.556610 51.605094,-0.556497 51.605127,-0.556932 51.605721,-0.556957 51.605716,-0.556996 51.605762,-0.557362 51.606358,-0.557871 51.606285,-0.558137 51.606830,-0.558160 51.606831,-0.558565 51.606737,-0.558738 51.606683,-0.559046 51.606604,-0.559817 51.606427,-0.559631 51.606001,-0.559621 51.605994,-0.559769 51.605927,-0.559883 51.605907,-0.560162 51.606333,-0.560324 51.606284,-0.560514 51.606200,-0.560712 51.606091,-0.560862 51.605994,-0.561002 51.605890,-0.561296 51.605647,-0.561838 51.605148,-0.561861 51.605114,-0.561859 51.605073,-0.561897 51.604982,-0.561840 51.604963,-0.561399 51.604706,-0.561037 51.604577,-0.560636 51.604477,-0.560665 51.604325,-0.560127 51.603984,-0.560169 51.603921,-0.559921 51.603771,-0.559191 51.603356,-0.558688 51.603654,-0.558748 51.603720,-0.557965 51.603936,-0.557659 51.604004,-0.557083 51.604117,-0.555957 51.604361,-0.556448 51.604965)))
point: POINT (-0.558908 51.605105)
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.