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: ZZZZDUESXE382
name: The Chiltern District Council (Land at Chalfont Centre For Epilepsy, Rickmansworth Lane, Chalfont St
tree-preservation-order: undefined
TPO/1990/005
tree-preservation-zone-type
geometry: MULTIPOLYGON (((-0.547239 51.619552,-0.547202 51.619503,-0.547174 51.619470,-0.547076 51.619340,-0.546983 51.619251,-0.546941 51.619207,-0.546871 51.619234,-0.546840 51.619257,-0.546829 51.619260,-0.546808 51.619269,-0.546790 51.619274,-0.546761 51.619279,-0.546747 51.619284,-0.546609 51.619344,-0.546474 51.619405,-0.546431 51.619422,-0.546383 51.619445,-0.546237 51.619485,-0.546013 51.619552,-0.545797 51.619612,-0.545637 51.619659,-0.545696 51.619748,-0.545708 51.619756,-0.545734 51.619765,-0.545749 51.619767,-0.545797 51.619765,-0.545844 51.619768,-0.545867 51.619774,-0.545876 51.619780,-0.546313 51.619673,-0.546350 51.619733,-0.546680 51.619722,-0.547088 51.619627,-0.547121 51.619679,-0.547140 51.619682,-0.547163 51.619681,-0.547180 51.619679,-0.547201 51.619673,-0.547223 51.619709,-0.547192 51.619720,-0.547180 51.619727,-0.547175 51.619735,-0.547170 51.619756,-0.547234 51.619854,-0.547415 51.619809,-0.547348 51.619700,-0.547318 51.619659,-0.547311 51.619647,-0.547285 51.619615,-0.547239 51.619552)))
point: POINT (-0.546618 51.619561)
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.