Change replication IP address on P2000 replicated volume

We have changed out WAN links and the IP address of a P2000 setup as a remote system. I now want to change the IP addresses used to replicate, so I thought I could do the following -

# set replication-volume-parameters link-type ISCSI remote-address 192.168.X.46:3260 XXXS01

Except I get an error -

Error: The command had an invalid parameter or unrecognized parameter. - Invalid secondary-address. (192.168.X.46:3260)
Error: The command had an invalid parameter or unrecognized parameter.

Anyone have any thoughts? If I have to delete the replication volume and re-add it, we have an issue due to the distances involved...