Create XY Channel associated to an existing time channel

Hi,

Suppose that in my Data Portal there is a group (e.g. "Group Test") containing a time channel ("Group Test/time") and several XY Channels ("Group Test/Var00", "Group Test/Var01", etc.)

I would like to create a new XY Channel  associated to "Group Test/time". It should be added to the same Group. This new Channel of course hs the same length as all the other channels of that group.

I am able to create a channel, but I cannot associate to the time reference

Running the script above, I get the error message "AttributeError: Property '<unknown>.XRelation' can not be set."

Is there a way to do it? Many thanks