def get_credit_query(self):
raise Unimplemented()<EOL>
Gets the query for an ackowledgement credit.

        Multiple retrievals produce a nested ``OR`` term.

        return: (osid.acknowledgement.CreditQuery) - the credit query
        raise:  Unimplemented - ``supports_credit_query()`` is ``false``
        *compliance: optional -- This method must be implemented if
        ``supports_credit_query()`` is ``true``.*