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: ZZZZZTESRW161
name: South Bucks District Council (No.4) Tree Preservation Order 1991; dated 4/6/91; made under Sections
tree-preservation-order: undefined
TPO/SBDC/1991/04
tree-preservation-zone-type
geometry: MULTIPOLYGON (((-0.627755 51.603781,-0.628375 51.603607,-0.628554 51.603552,-0.628805 51.603469,-0.628901 51.603434,-0.629052 51.603372,-0.629343 51.603236,-0.629471 51.603164,-0.629667 51.603043,-0.629900 51.602892,-0.629991 51.602836,-0.629960 51.602817,-0.629939 51.602823,-0.629893 51.602832,-0.629847 51.602837,-0.629439 51.603111,-0.629089 51.603177,-0.627976 51.603310,-0.627955 51.603290,-0.627934 51.603275,-0.627874 51.603244,-0.627857 51.603236,-0.627822 51.603225,-0.627791 51.603220,-0.627659 51.603215,-0.626936 51.603221,-0.627118 51.603530,-0.627232 51.603527,-0.627267 51.603522,-0.627337 51.603505,-0.627370 51.603502,-0.627428 51.603506,-0.627443 51.603508,-0.627456 51.603512,-0.627474 51.603531,-0.627511 51.603564,-0.627524 51.603578,-0.627558 51.603622,-0.627592 51.603659,-0.627602 51.603673,-0.627616 51.603689,-0.627638 51.603710,-0.627663 51.603732,-0.627724 51.603768,-0.627755 51.603781)))
point: POINT (-0.628149 51.603389)
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.