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: ZZZZZXESRW061
name: South Bucks District Council (No. 20) Tree Preservation Order 1988; dated 2/12/88; made under Sectio
tree-preservation-order: undefined
TPO/SBDC/1988/20
tree-preservation-zone-type
geometry: MULTIPOLYGON (((-0.648954 51.608063,-0.649394 51.608055,-0.649356 51.608340,-0.649718 51.608361,-0.649801 51.608393,-0.650328 51.608141,-0.650360 51.608129,-0.650489 51.608091,-0.650543 51.608070,-0.650566 51.608054,-0.650586 51.608033,-0.650600 51.607997,-0.650612 51.607976,-0.650639 51.607939,-0.650664 51.607914,-0.650654 51.607903,-0.650492 51.607797,-0.650476 51.607784,-0.650454 51.607761,-0.650438 51.607741,-0.650418 51.607721,-0.650245 51.607560,-0.650019 51.607356,-0.649866 51.607423,-0.649652 51.607535,-0.649499 51.607607,-0.648823 51.607090,-0.648810 51.607096,-0.648807 51.607100,-0.648509 51.607261,-0.648608 51.607268,-0.648630 51.607294,-0.648648 51.607323,-0.648645 51.607369,-0.648667 51.607501,-0.648729 51.607710,-0.648829 51.607749,-0.648955 51.607958,-0.648954 51.608063)))
point: POINT (-0.649586 51.607794)
notes
entry-date: 2017-07-04
start-date: 2017-07-04
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.