[Anthill-pro] getting Stamp Value

[Byron Vonthal]

I'm trying to pass the stamp value from a workflow property; it's not
working. AHP 3.2.1

I've tried all of these combinations, but get the text instead of the
value.

$workflow.BuildLife.LatestStampValue
${StampLookup.getLatestStampValue()}
${workflow.BuildLife.LatestStampValue}
${workflow.BuildLife.LatestStampValue()}
${bsh:StampLookup.getLatestStampValue()}
workflow.BuildLife.LatestStampValue()

anyone know the right syntax?