Oracle Error Codes

illegal JOIN KEY clause

A JOIN KEY clause was specified 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 level satisfy 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 in the hierarchy.

How to Solve :

Modify the JOIN KEY clause so that it satisfies the conditions mentioned above.