(1) If the rent or usufructuary rent is collected before it is attached to the benefit of the mortgage creditor, or if it is alienated in another way prior to the attachment, the disposition is effective in relation to the mortgage creditor. If the disposition consists of the transfer of the claim to a third party, then the liability for the claim is extinguished; if a third party acquires a right to the claim, this right has priority over the mortgage.
(2) The disposition is ineffective in relation to the mortgage creditor to the extent that it relates to the rent or usufructuary rent for a time later than the calendar month current at the time of the attachment; however, if the attachment is made after the fifteenth day of the month, the disposition is effective insofar as it relates to the rent or usufructuary rent for the following calendar month.
(3) If the plot of land is alienated without the claim, this is equivalent to the transfer of the claim to a third party.