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: ZZZZDVESXE552
name: Amersham Rural District Council (Claydon Lane, Chalfont St Peter) Tree Preservation Order, 1966 Conf
tree-preservation-order: undefined
TPO/1966/037
tree-preservation-zone-type
geometry: MULTIPOLYGON (((-0.552666 51.598287,-0.552660 51.598290,-0.552659 51.598298,-0.552673 51.598319,-0.552867 51.598549,-0.552898 51.598590,-0.552908 51.598591,-0.552926 51.598584,-0.552933 51.598575,-0.552947 51.598570,-0.552959 51.598553,-0.552967 51.598545,-0.552965 51.598524,-0.552955 51.598517,-0.552937 51.598518,-0.552887 51.598515,-0.552873 51.598510,-0.552857 51.598498,-0.552852 51.598484,-0.552825 51.598460,-0.552817 51.598446,-0.552805 51.598438,-0.552785 51.598412,-0.552774 51.598405,-0.552767 51.598388,-0.552755 51.598382,-0.552751 51.598373,-0.552750 51.598361,-0.552741 51.598354,-0.552726 51.598346,-0.552717 51.598331,-0.552711 51.598317,-0.552699 51.598306,-0.552695 51.598297,-0.552686 51.598290,-0.552677 51.598287,-0.552666 51.598287)))
point: POINT (-0.552826 51.598465)
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.