All Oracle Error CodesOracle DBA Forum

ORA-32314:

REFRESH FAST of "string"."string" unsupported after deletes/updates
Cause: One or more deletes or updates has been performed on one or more of the detail tables referenced by the specified materialized view. This materialized view does not support fast refresh after deletes or updates.
Action: Use REFRESH COMPLETE. Note: you can determine why your materialized view does not support fast refresh after deletes or updates using the DBMS_MVIEW.EXPLAIN_MVIEW() API.