Hi Davide,
I am not sure, what you are doing in the "process" part.
However, according to the Repository explorer, the BusinessPartnerDuplicateCheck Bo is released in the public solution model but only only for reading:
Image may be NSFW.
Clik here to view.
So please check whether you unintentionally try to modify any part of the BusinessPartnerDuplicateCheck Bo in the processing code.
Alternatively it might be (this happened to me already once) that a BO or parts of it are marked as released but read-only for use in the public solution Model and accessing this does not work.
If you are positively sure everything should definitely work I would recommend to file an incident in the PDI workcenter describing the situation. Usually this has been fixed by SAP development with the next PDI release cycle.
Best regards,
Ludger
