ORA-30401: JOIN KEY columns must be non

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ORA-30401: JOIN KEY columns must be non-null
Cause: The dimensionstatement failed because the column(s) in the JOIN KEY
clause permitted NULL values. The JOIN KEY columns are related to the columns
of the dimension's skip levels in one or both of the following ways:
1. A skip level is defined over one or more of the JOIN KEY columns.
2. The attribute clauses of a skip level determine one or more of the JOIN KEY
columns.
Action: Modify the JOIN KEYcolumns so that they do not allow NULL values.