Dell VSM : replication Schedule Issue

Hello.

I installed VSM 4.0 on my 5.5 vCenter. I try schedule Datastore replication, but when I launch the wizard (Add replication Schedule), I have errors that say :

- Cannot find target volume xxxxxsnap : volume does not exist
- Cannot find target volume yyyyysnap : volume does not exist
- PS Volume for xxxx is not configured for replication
- PS Volume for yyyy is not configured for replication
- PS Volume for datastore zzzzz is not configured for replication

But replication is allready configured for the datastore zzzz, and xxxx / yyyy volumes are existing on my Equallogic, but are not datastores. Both volume are mounted via iSCSI in my guest VMs.

Thanks in avance for your help.