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: ZZZZDUESXE965
name: The Chiltern District Council (Land at and adjoining Ecclesburn, Newbold and Culvermead, Copperkins
tree-preservation-order: undefined
TPO/1986/016
tree-preservation-zone-type
geometry: MULTIPOLYGON (((-0.620382 51.684501,-0.620378 51.684501,-0.620255 51.684453,-0.620112 51.684387,-0.620051 51.684355,-0.619977 51.684393,-0.619965 51.684394,-0.619958 51.684393,-0.619945 51.684387,-0.619896 51.684343,-0.619875 51.684356,-0.619862 51.684361,-0.619853 51.684363,-0.619836 51.684362,-0.619746 51.684314,-0.619725 51.684307,-0.619693 51.684301,-0.619646 51.684302,-0.619638 51.684300,-0.619618 51.684292,-0.619577 51.684267,-0.619534 51.684298,-0.619533 51.684304,-0.619534 51.684305,-0.619602 51.684343,-0.619971 51.684558,-0.620155 51.684670,-0.620276 51.684736,-0.620405 51.684750,-0.620439 51.684748,-0.620461 51.684745,-0.620507 51.684735,-0.620548 51.684719,-0.620582 51.684699,-0.620658 51.684636,-0.620476 51.684558,-0.620503 51.684540,-0.620382 51.684501)))
point: POINT (-0.620155 51.684533)
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.