Some FWC's, thus ECAM procedures have been updated with new OEB's, some not. A message "REFER TO QRH PROC" is displayed on the E/WD/STS page whatever there's a POB overriding the existing ECAM. In such a case, the use of QRH is mandatory. By the way, each time the crew has a good reason to believe that an ECAM procedure ain't the best action to cope with the failure, it is possible either to refer on QRH or do the best thing yourself (eg. ECAM instructs you to shutting off the last hydraulic system available).
fredgrav