Tree preservation zone

There is a problem

tree-preservation-order column must match the reference field in the tree preservation order dataset

reference: TPO129
name: Marlouvic Old Station Yard
tree-preservation-order: undefined
South Killingholme 1985
tree-preservation-zone-type: group
geometry: MULTIPOLYGON (((-0.299586 53.618882,-0.299886 53.618809,-0.300012 53.618780,-0.299973 53.618719,-0.299968 53.618708,-0.299970 53.618698,-0.299918 53.618562,-0.299890 53.618479,-0.299872 53.618388,-0.299870 53.618323,-0.299864 53.618277,-0.299863 53.618248,-0.299852 53.618218,-0.299825 53.618129,-0.299819 53.618102,-0.299804 53.618054,-0.299794 53.618030,-0.299780 53.617982,-0.299766 53.617951,-0.299754 53.617929,-0.299772 53.617825,-0.299781 53.617783,-0.299796 53.617727,-0.299821 53.617653,-0.299846 53.617567,-0.299858 53.617507,-0.299867 53.617434,-0.299866 53.617392,-0.299857 53.617323,-0.299461 53.617427,-0.299080 53.617525,-0.298696 53.617630,-0.298496 53.617681,-0.298571 53.617786,-0.298816 53.618049,-0.299004 53.618257,-0.299157 53.618415,-0.299505 53.618801,-0.299586 53.618882)))
point: POINT (-0.299385 53.618047)
notes
entry-date: 1986-01-16
start-date: 1985-11-21
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.