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>.