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: ZZZZDVESXE398
name: The Chiltern District Council (Turners Wood, Chalfont St Giles and Chalfont St Peter) Tree Preservat
tree-preservation-order: undefined
TPO/1978/001
tree-preservation-zone-type
geometry: MULTIPOLYGON (((-0.563572 51.628889,-0.563685 51.628873,-0.563642 51.628688,-0.563620 51.628681,-0.563612 51.628655,-0.563627 51.628644,-0.563604 51.628583,-0.563548 51.628449,-0.563511 51.628368,-0.563459 51.628268,-0.563393 51.628149,-0.563199 51.627842,-0.563140 51.627753,-0.562962 51.627527,-0.562942 51.627495,-0.562916 51.627467,-0.562894 51.627435,-0.562814 51.627402,-0.562796 51.627402,-0.562786 51.627350,-0.562815 51.627339,-0.562636 51.627139,-0.562602 51.627145,-0.562566 51.627097,-0.562551 51.627067,-0.562541 51.627058,-0.562076 51.627203,-0.561981 51.627230,-0.561785 51.627279,-0.561700 51.627303,-0.561877 51.627514,-0.562231 51.627951,-0.562448 51.628213,-0.562537 51.628324,-0.562360 51.628384,-0.562770 51.628898,-0.563520 51.628717,-0.563572 51.628889)))
point: POINT (-0.562738 51.627996)
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.