Recently doing TimesTen related,
When I finish table to field when writing descriptive information
Using the COMMENT ON complains

 
COMMENT ON the COLUMN CAR_INFO. CAR_ID IS 'PK'; 

The failure information is as follows:

COMMENT ON the TABLE CAR_INFO IS 'PK' failure,
TT1001: Syntax error in the SQL statement before or at: "COMMENT", character position: 1