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-7040: Referential constraint not allowed 

Explanation:

There is already a referential CONSTRAINT definition with the specified referencing table. Moreover, CASCADE dependency arises. Under these conditions, all <CONSTRAINT definition>s with the indicated referencing table must specify either CASCADE or RESTRICT.

User Action:

Rethink the desired effect, because it would result in basically contesting situations. Use a QUERY statement issued on the system table DOMAIN.FOREIGNKEYCOLUMNS to see a list of the existing CONSTRAINT definitions.

 

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