Encumbrance duration of reverse repo in NSFR when the received collateral has been sold short

When the received collateral through a reverse repo has been sold outright, what should the encumbrance duration for the reverse repo be?

In the instruction on reporting of items requiring stable funding (Annex XIII, point 17), it states that “ The residual maturity of this encumbrance shall be the higher between: i) the residual maturity of the transaction where the assets were borrowed and ii) the residual maturity of the transaction where the assets were re-pledged ”. The question is when the received collateral via a reverse repo has been sold outright, then what is the encumbrance duration for the reverse repo?  BCBS published a FAQ in d396.pdf to allow the use of the maturity date of the reverse repo :  "5.1.d...If the collateral has been sold outright, thereby creating a short position, the corresponding onbalance sheet receivable should be considered encumbered for the term of the residual maturity of this receivable, and receive an RSF factor according to the answer to question 5.1.c above". Should we follow the BCBS approach for this case? Or should we apply a more conservative approach by taking the higher between the maturity of the reverse repo and the maturity date of the security itself?