f)If any withholding certificate, withholding statement, document, authorisation or waiver provided to the ECA Agent by a Lender pursuant to paragraph (e) above is or becomes materially inaccurate or incomplete, that Lender shall promptly update it and provide such updated withholding certificate, withholding statement, document, authorisation or waiver to the ECA Agent unless it is unlawful for the Lender to do so (in which case the Lender shall promptly notify the ECA Agent).