I am using advantage database server with advantage data arc

Question

I am using advantage data architect it is very diffifult to use it does not provide table design and how to modify the column data type i have given a data type of Blod whcih i want to change boolean 

how to do when i do it says

"

poQuery: Error 7200: AQE Error: State = 42000; NativeError = 2115; [iAnywhere Solutions][Advantage SQL Engine]Expected lexical element not found: Expecting either "ADD", "ALTER", or "DROP". -- Location of error

in the SQL statement is: 13

"

below my query

ALTER TABLE UsersDetails MODIFY IsNever BOOLEAN