Cause: The propagation of LOB data from materialized view sites to the master site requires a primary key on the replicated table. Thus updatable ROWID materialized views that contain LOB columns are not supported. See the solution below.
Error solution: Create a primary key materialized view instead of a ROWID materialized view. If the materialized view already exists, it can be converted to a primary key materialized view using the ALTER MATERIALIZED VIEW DDL command.
Database version: Oracle 11g Release 2 (11.2)