ORA-12017: cannot alter primary key mview ‘string’ to a rowid mview
Cause: An attempt was made to convert the primary key of a materialized view to a ROWID materialized view.
Action: Conversion of a primary key materialized view to a ROWID materialized view is not supported. Create a new materialized view with ROWIDs or drop and recreate the materialized view with ROWIDs.