If the SharePlex replication is set up for source and target to be on the same server, by default the export queue is not created and SharePlex Manager does not support this type of configuration.
To work around the problem, you can create named export queue in config.
For example: owner. table_name1 owner.table_name2 sourcehost:exp*targethost:p1@o.targetSID
In this case source host and target host are the same, exp is the export queue name and p1 is the post queue name.