ViewPoint access in AQL and/or Java

In a PAB I created a Behaviour PC and, having the basic price ViewPoint installed and activated, I added a Price extension to my component.

Now, I’d like to be able to retreive price informations from AQL or Java.
Having selected the component in the project explorer, I tried to use the Sirius Interpretor view and type : aql:self.ownedExtensions() but I obtained an empty list as a result.

It doesn’t seem that simple …

Is there a way to do that in aql or in java ? (I wish there is…)

Thank you in advance.

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