ORA-30457: 'string.string' cannot be refreshed

admin

ORA-30457: 'string.string' cannot be refreshed because of unmnanaged NOTNULL
columns in container
Cause: The container objectfor the summary contains one or more unmanaged
columns do not allow nulls, and which do not specify a default valur for those
columns.
Action: Make sure thatdefault values are specified for all NOT NULL columns
that are not part of the summary definition.
18-66 Oracle Database ErrorMessages