In a mixed-version environment, the route version between the primary and replicate Replication Servers determines which features are supported.
A replication definition created with unichar or univarchar columns is not propagated to Replication Server version 12.1 and earlier.
A replication definition created with unitext columns is not propagated to Replication Server version 12.6 and earlier.
A replication definition subscribed by Replication Server version 12.1 and earlier cannot be altered to add unichar or univarchar.
A replication definition subscribed by Replication Server version 12.6 and earlier cannot be altered to add unitext columns.
If a replication definition is altered to add unichar or univarchar columns, it is dropped from 12.1 and earlier versions of downstream Replication Servers, and the oldest replication definition that is compatible with version 12.1 and earlier is propagated.
A replication definition created with unichar or univarchar columns is propagated to Replication Server version 12.1 or earlier if the unichar or univarchar columns are removed.
Similarly, a replication definition created with unitext columns is propagated to Replication Server version 12.6 or earlier if the unitext columns are removed.
