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: ZZZZDVESXE770
name: The Urban District of Chesham Interim Preservation Order No 1 Approved by Minister of Town and Count
tree-preservation-order: undefined
TPO/1948/077
tree-preservation-zone-type
geometry: MULTIPOLYGON (((-0.610693 51.720415,-0.610680 51.720460,-0.610685 51.720495,-0.610696 51.720536,-0.610719 51.720570,-0.610759 51.720597,-0.610795 51.720614,-0.610860 51.720639,-0.610949 51.720649,-0.611023 51.720643,-0.611086 51.720623,-0.611130 51.720600,-0.611162 51.720557,-0.611183 51.720513,-0.611191 51.720478,-0.611197 51.720463,-0.611201 51.720436,-0.611198 51.720412,-0.611189 51.720388,-0.611180 51.720373,-0.611166 51.720356,-0.611142 51.720335,-0.611118 51.720319,-0.611098 51.720309,-0.611069 51.720298,-0.611030 51.720288,-0.610985 51.720282,-0.610934 51.720282,-0.610889 51.720288,-0.610806 51.720311,-0.610758 51.720330,-0.610744 51.720341,-0.610726 51.720359,-0.610711 51.720377,-0.610693 51.720415)))
point: POINT (-0.610943 51.720464)
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.