Francois, I think perhaps you misunderstood me. In your dual-stack systems, SAPJSF must have SAP_BC_JSF_COMMUNICATION. Having the RO role is not sufficient. Either add the non-RO role, or replace the RO role with the non-RO role (I don't think you actually need both, just one or the other, and in this case the non-RO role is the one that is needed.
Best regards,
Matt