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: ZZZZDVESXE521
name: The Amersham Rural District Council (West Witheridge and Witcherts House) Tree Preservation Order -
tree-preservation-order: undefined
TPO/1969/049
tree-preservation-zone-type
geometry: MULTIPOLYGON (((-0.658211 51.623513,-0.658136 51.623614,-0.658726 51.623920,-0.659271 51.623980,-0.659575 51.623961,-0.659758 51.623966,-0.660071 51.623983,-0.660185 51.623991,-0.660033 51.623794,-0.659708 51.623404,-0.659655 51.623347,-0.659608 51.623300,-0.659583 51.623280,-0.659486 51.623211,-0.659291 51.623190,-0.659182 51.623228,-0.659104 51.623252,-0.658972 51.623287,-0.658855 51.623309,-0.658810 51.623316,-0.658724 51.623323,-0.658688 51.623324,-0.658643 51.623322,-0.658502 51.623326,-0.658592 51.623383,-0.658446 51.623472,-0.658404 51.623486,-0.658390 51.623478,-0.658359 51.623464,-0.658292 51.623428,-0.658211 51.623513)))
point: POINT (-0.659173 51.623631)
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.