thanks, in my haste i missed the separate pages for listview / item / header.
HOWEVER... in a quick " SetLabel" method test, I get error "240 obj ref not valid lsthdr" using code below. The justification code works so the obj ref is fine. The Term-field parameter is the one used in the original code above to set the col header in the first place so should also be fine.
evaluate LVdats2-ITEM-ALIGN(k)
when "R"
INVOKE LVdats2-item-objref(k) "rightJustified"
when "C"
INVOKE LVdats2-item-objref(k) "centered"
when other
INVOKE LVdats2-item-objref(k) "leftJustified"
end-evaluate
invoke LVdats2-item-objref(k) "SetLabel" using Term-Field