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: ZZZZDTESXE891
name: The Chiltern District Council (Land at Chesham Community Hospital, Hospital Hill, Chesham HP5 1PJ) T
tree-preservation-order: undefined
TPO/2005/004
tree-preservation-zone-type
geometry: MULTIPOLYGON (((-0.606754 51.701226,-0.607211 51.701377,-0.607414 51.701477,-0.607732 51.701673,-0.608132 51.701940,-0.608295 51.702066,-0.608955 51.702522,-0.609194 51.702737,-0.609988 51.703350,-0.610070 51.703432,-0.610124 51.703433,-0.610159 51.703466,-0.610727 51.703493,-0.610742 51.703461,-0.610738 51.703431,-0.610715 51.703389,-0.610698 51.703305,-0.610706 51.703292,-0.610684 51.703261,-0.610746 51.703242,-0.610658 51.703073,-0.610530 51.702888,-0.610401 51.702725,-0.610292 51.702608,-0.610172 51.702509,-0.609637 51.702157,-0.609520 51.702072,-0.609389 51.701968,-0.608931 51.701543,-0.608187 51.701140,-0.607976 51.701066,-0.607856 51.700958,-0.607838 51.700905,-0.607671 51.701019,-0.607466 51.700911,-0.607023 51.700865,-0.606780 51.700788,-0.606791 51.700816,-0.606928 51.700941,-0.606938 51.701097,-0.606754 51.701226)))
point: POINT (-0.608914 51.702109)
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.