I have narrowed the problem down to the NAS Settings.
We use a NIS Server in our environment, so I activated the NIS option in Authentication method.
As soon as I change from NIS to internal LDAP the destination volume appears in the replication task window.
Are there any VLANs or other security policies in place, very hard to see why changing an Authentication method allows the volumes to be online. Now if the volume in the replication feature was not set correctly and the origanal was not set to destination then ok but for an Authentication method might lean to an outside issue.