How to update Materialized View after changing Primary Key of Master Table on HOST

Hi,

In HOST DB, I added 1 column to an existing table and added it to its Primary key.

In Branch DB, whose database link points to HOST, I added that column in materialized view table.

Would like to know how to edit materialized view to add new column, as while doing so it gives error saying:

"ORA-23412: Master table's primary key columns have changed"

Thanks

Niti