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: 88/00354/C/1
name: Land Rear Of The Grove, Hipperholme
tree-preservation-order: undefined
88/00354/C
tree-preservation-zone-type: group
geometry: MULTIPOLYGON (((-1.809229 53.730667,-1.809211 53.730673,-1.809158 53.730669,-1.809090 53.730647,-1.809044 53.730641,-1.809001 53.730645,-1.808975 53.730667,-1.809144 53.730834,-1.809365 53.730612,-1.810141 53.729871,-1.810074 53.729838,-1.808493 53.730067,-1.808292 53.730081,-1.808314 53.730111,-1.808346 53.730120,-1.808538 53.730105,-1.810025 53.729882,-1.809853 53.730059,-1.809568 53.730324,-1.809229 53.730667)),((-1.809002 53.730618,-1.808913 53.730571,-1.808619 53.730362,-1.808407 53.730198,-1.808389 53.730189,-1.808325 53.730191,-1.808239 53.730131,-1.808184 53.730115,-1.808176 53.730130,-1.808519 53.730379,-1.808916 53.730685,-1.808937 53.730681,-1.809002 53.730618)))
point: POINT (-1.809173 53.730279)
notes: Oak, beech, sycamore, hawthorn
entry-date: 1988-12-23
start-date: 1988-12-23
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.