Houdini19.0.589
I creating a custom "Detail" attribute with the attributewrangle sop VEXpression.
I'm trying to use the chopnet fetchparameters chop node to acquire the "Detail" attribute value.
I'm using a "Detail" attribute because only one value is needed per frame.
Its not working. I get an error message "The specified path XVAL is invalid".

The chops fetch node can acquire built in channel values for tx, ty or tz as long as the channel has keyframes set.
If no channel keyframes are set in the sop node the chops fetch node does not receive values.

Anyone have ideas how I can resolve this?