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: ZZZZDUESXE471
name: The Chiltern District Council (Land at Raans County Secondary School, Quill Hall Lane / Raans Road,
tree-preservation-order: undefined
TPO/1989/022
tree-preservation-zone-type
geometry: MULTIPOLYGON (((-0.585968 51.676324,-0.585852 51.676143,-0.585801 51.676056,-0.585770 51.676013,-0.585760 51.676007,-0.585750 51.675991,-0.585745 51.675976,-0.585746 51.675964,-0.585753 51.675937,-0.585805 51.675772,-0.585816 51.675726,-0.586045 51.675135,-0.586063 51.675094,-0.586066 51.675079,-0.586066 51.675067,-0.586055 51.675055,-0.586040 51.675045,-0.586014 51.675039,-0.585987 51.675043,-0.585969 51.675058,-0.585938 51.675132,-0.585669 51.675863,-0.585643 51.675938,-0.585641 51.675983,-0.585644 51.675995,-0.585661 51.676020,-0.585677 51.676038,-0.585817 51.676275,-0.585966 51.676498,-0.586211 51.676820,-0.586218 51.676827,-0.586231 51.676836,-0.586244 51.676840,-0.586254 51.676842,-0.586275 51.676843,-0.586297 51.676839,-0.586300 51.676833,-0.586298 51.676824,-0.586199 51.676668,-0.586104 51.676525,-0.586053 51.676457,-0.585968 51.676324)))
point: POINT (-0.585906 51.675949)
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.