671.6. For the purposes of this chapter, the Minister may determine that a beneficiary under a designated trust for a taxation year of the designated trust, or a member of a partnership that is a beneficiary under a designated trust for a taxation year of the designated trust, is a designated beneficiary under the designated trust for the year, if the Minister is of the opinion that the share, for the year, of the aggregate of the income interests or of the aggregate of the capital interests in the designated trust of the beneficiary or member, or of the aggregate of the income interests or of the aggregate of the capital interests in the designated trust of any person or partnership with whom or with which the beneficiary or member is not dealing at arm’s length, has been reduced by reason of a transaction or event or a series of transactions or events.