Same as my reply to Nick…
“Yes, more precisely a list of qualified values where each qualified value has three attributes (value, quality and timestamp) hence my suffix [0].value in the read instruction. I don’t think my script is an issue…the exact script works properly when I call it from the Project script library…just not in the component customer methods.” so it must be something else…similar to what I found in "system" functions not available from client ?