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: ZZZZDUESXE573
name: The Chiltern District Council (Land adjacent to 5 and 7 Highover Park, Amersham, Buckinghamshire) Tr
tree-preservation-order: undefined
TPO/1989/005
tree-preservation-zone-type
geometry: MULTIPOLYGON (((-0.604256 51.667625,-0.604246 51.667643,-0.604245 51.667657,-0.604248 51.667671,-0.604260 51.667683,-0.604279 51.667696,-0.604302 51.667706,-0.604316 51.667720,-0.604326 51.667736,-0.604332 51.667754,-0.604336 51.667780,-0.604348 51.667796,-0.604367 51.667804,-0.604385 51.667809,-0.604405 51.667810,-0.604425 51.667805,-0.604445 51.667797,-0.604466 51.667792,-0.604512 51.667794,-0.604532 51.667801,-0.604542 51.667814,-0.604549 51.667829,-0.604570 51.667840,-0.604592 51.667842,-0.604612 51.667841,-0.604636 51.667834,-0.604656 51.667824,-0.604673 51.667805,-0.604669 51.667782,-0.604653 51.667766,-0.604622 51.667755,-0.604578 51.667749,-0.604551 51.667738,-0.604536 51.667719,-0.604528 51.667706,-0.604518 51.667696,-0.604504 51.667688,-0.604468 51.667680,-0.604404 51.667678,-0.604390 51.667672,-0.604380 51.667662,-0.604383 51.667647,-0.604379 51.667632,-0.604339 51.667607,-0.604323 51.667605,-0.604304 51.667605,-0.604285 51.667608,-0.604273 51.667612,-0.604256 51.667625)))
point: POINT (-0.604442 51.667733)
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.