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: ZZZZDVESXE530
name: The Bucks County Council (Amersham and Eton Rural Districts) Tree Preservation (Amendment) Order No
tree-preservation-order: undefined
TPO/1968/002
tree-preservation-zone-type
geometry: MULTIPOLYGON (((-0.543744 51.592194,-0.543733 51.592170,-0.543733 51.592175,-0.543503 51.592031,-0.543288 51.591910,-0.543358 51.591962,-0.543382 51.591974,-0.543395 51.591978,-0.543433 51.592003,-0.543542 51.592063,-0.543641 51.592122,-0.543701 51.592163,-0.543708 51.592169,-0.543724 51.592191,-0.543744 51.592194)),((-0.542557 51.590462,-0.542553 51.590463,-0.542557 51.590475,-0.542897 51.590788,-0.542557 51.590462)),((-0.542837 51.591680,-0.542845 51.591687,-0.542780 51.591612,-0.542710 51.591544,-0.542714 51.591556,-0.542726 51.591576,-0.542735 51.591586,-0.542756 51.591605,-0.542780 51.591619,-0.542792 51.591630,-0.542837 51.591680)),((-0.542678 51.591420,-0.542681 51.591429,-0.542666 51.591349,-0.542681 51.591262,-0.542661 51.591348,-0.542678 51.591420)),((-0.542692 51.590774,-0.542679 51.590754,-0.542697 51.590789,-0.542692 51.590774)),((-0.542746 51.590999,-0.542745 51.590994,-0.542738 51.591032,-0.542746 51.590999)),((-0.542913 51.591726,-0.542866 51.591705,-0.542868 51.591706,-0.542913 51.591726)))
point: POINT (-0.543108 51.59151)
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.