text: -- Updating the FK_VALIDATION_STAMP_BRANCH constraint
  ALTER TABLE VALIDATION_STAMP DROP CONSTRAINT FK_VALIDATION_STAMP_PROMOTION_LEVEL;
  ALTER TABLE VALIDATION_STAMP ADD CONSTRAINT FK_VALIDATION_STAMP_PROMOTION_LEVEL FOREIGN KEY (PROMOTION_LEVEL) REFERENCES PROMOTION_LEVEL (ID) ON DELETE SET NULL;
  -- @mysql
  -- See update 26
  