Accessing the "opi_file" property of the Linking Container

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Hello everyone.

I would like to set the OPI file name in the "opi_file" property of the Linking Container widget using a script or Rule on CSS BOY,
but I can't.

I am trying to access the "opi_file" property with a Python script like the following

display.getWidget("Linking Container").setPropertyValue("opi_file", "/CSS/test/aaa.opi")

However, when I run it, nothing is displayed.
Why is this?

Thank you very much for your answer.

M.Kudo