This may be caused by one of the following:
- An INSERT or UPDATE statement issued on a table that is the referencing table in a REFERENTIAL CONSTRAINT DEFINITION produces a row that is not a matching row of the CONSTRAINT definition. When deleting rows from a REFERENCED TABLE of a REFERENTIAL CONSTRAINT DEFINITION with ON DELETE RESTRICT in the DELETE RULE, a matching row exists.
- When executing a REFERENTIAL CONSTRAINT DEFINITION, the REFERENCED TABLE or referencing table contains rows which conflict with the CONSTRAINT definition.