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: ZZZZDVESXE572
name: Amersham Rural District Council (Hill Farm, Chalfont St Peter) Tree Preservation Order, 1966 Confirm
tree-preservation-order: undefined
TPO/1966/034
tree-preservation-zone-type
geometry: MULTIPOLYGON (((-0.551043 51.609536,-0.551012 51.609468,-0.550998 51.609453,-0.550968 51.609441,-0.550867 51.609433,-0.550840 51.609461,-0.550836 51.609479,-0.550907 51.609558,-0.550982 51.609619,-0.550996 51.609657,-0.550988 51.609726,-0.551017 51.609742,-0.551031 51.609766,-0.551028 51.609772,-0.550992 51.609767,-0.550949 51.609774,-0.550895 51.609823,-0.550862 51.609838,-0.550835 51.609870,-0.550784 51.609869,-0.550762 51.609890,-0.550769 51.609916,-0.550753 51.609924,-0.550630 51.609949,-0.550649 51.609978,-0.550748 51.609968,-0.550828 51.609982,-0.550880 51.609971,-0.550981 51.609919,-0.551149 51.609788,-0.551155 51.609767,-0.551126 51.609683,-0.551087 51.609635,-0.551083 51.609601,-0.551043 51.609536)))
point: POINT (-0.550957 51.609738)
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.