ORA-30398: illegal JOIN KEY clause

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ORA-30398: illegal JOIN KEY clause
Cause: A JOIN KEY clause wasspecified that did not conform to certain
requirements. A JOIN KEY clause connecting a child level with its non-immediate
ancestor level is allowed only when that child level and its ancestor levelsatisfy
the following conditions:
1. The immediate parent of the child level must be a skip level.
2. The child level cannot be a skip level.
3. The ancestor level must be a non-skip level.
4. The ancestor level must be the nearest non-skip level to the child level inthe
hierarchy.
Action: Modify the JOIN KEYclause so that it satisfies the conditions mentioned
above.