Hi, I couldn't find any explanations of error messages in the docs. I get this error message: ERROR: triggered data change violation on relation "22" after doing DELETE FROM "22" WHERE id = 36; There's no foreign keys referring to this table, nor any triggers that I have explicitly defined. This occurs inside a transaction. When I tried it outside the transaction it worked fine! Anyone got any idea of what is going on? Do you need more information? Cheers, Gisle