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: ZZZZDTESXE745
name: The Chiltern District Council (Land at Princess Marina Centre, Chalfont Road, Seer Green) Tree Prese
tree-preservation-order: undefined
TPO/1998/027
tree-preservation-zone-type
geometry: MULTIPOLYGON (((-0.601926 51.625554,-0.602260 51.625357,-0.602515 51.625329,-0.602671 51.625292,-0.603085 51.624735,-0.603325 51.624398,-0.603591 51.624089,-0.602847 51.623845,-0.602528 51.623963,-0.601518 51.623665,-0.601142 51.623550,-0.601181 51.623497,-0.600789 51.623382,-0.600770 51.623409,-0.600761 51.623425,-0.600667 51.623546,-0.600659 51.623552,-0.600658 51.623556,-0.600613 51.623603,-0.600409 51.623833,-0.600345 51.623903,-0.600548 51.624013,-0.600540 51.624039,-0.600528 51.624092,-0.600572 51.624125,-0.600690 51.624206,-0.600664 51.624228,-0.601004 51.624565,-0.601032 51.624591,-0.600919 51.624704,-0.600876 51.624749,-0.600828 51.624804,-0.600811 51.624834,-0.600756 51.624943,-0.600910 51.625008,-0.601178 51.625118,-0.601239 51.625145,-0.601926 51.625554)))
point: POINT (-0.601891 51.624447)
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.