--- ABS-123334/ ABS-123659
ALTER TABLE INVOICEHEADER ADD CONSTRAINT CHK_INVOICEHEADER_EMAILST CHECK (EMAILSTATUS in (0, 1, 2, 3, 4));
COMMENT ON COLUMN INVOICEHEADER.EMAILSTATUS
  IS '0=Not applicable (email address empty) 
      1=Ready to be send 
      2=Exported/Send 
      3=Needs to create PDF 
      4=Not sent due to size limit';
