Thank you for your post.
There is an error in the documentation that was previously reported by another forum user:
The correct syntax is as follows:
field_name field_type [[repetitions (1 to 32000)]] [DEFAULT expr]
[UNIQUE | NOT NULL | PRIMARY KEY | GLOBAL]
[EXTERNAL relative_path_string [SECURE | OPEN calc_path_string]]
We apologize for any inconvenience this may have caused.