IF NOT EXISTS(
    SELECT *
    FROM sys.columns 
    WHERE Name      = N'additionalDescription'
      AND Object_ID = Object_ID(N'pal_Procedure'))
BEGIN
    ALTER TABLE pal_Procedure
	ADD additionalDescription BIT; 
END
IF NOT EXISTS(
    SELECT *
    FROM sys.columns 
    WHERE Name      = N'additionalDescriptionOptions'
      AND Object_ID = Object_ID(N'pal_Procedure'))
BEGIN
    ALTER TABLE pal_Procedure
	ADD additionalDescriptionOptions VARCHAR(350); 
END