Hi everybody,

I'm trying to run this command:
ALTER COLUMN PROPID I NULL ALTER COLUMN SITEID I NULL ALTER COLUMN SITEID2 I NULL ALTER COLUMN ASSRID I NULL ALTER COLUMN TRANID I NULL ALTER COLUMN MISCID I NULL ALTER COLUMN CREDID I NULL ALTER COLUMN COMPLEVL C (1) NULL ALTER COLUMN COMPLEVL DROP CHECK ALTER COLUMN SOURCE C (1) NULL ALTER COLUMN SOURCE DROP CHECK ALTER COLUMN PREFCODE C (1) NULL ALTER COLUMN SITESRCE C (1) NULL ALTER COLUMN CCODE C (2) NULL ALTER COLUMN TOWN C (4) NULL

and I'm getting Error "No rule to drop". I checked table and all rules, which I'm trying to drop, exist. Anyway, this syntax doesn't seem right.

Could you please tell me, what's wrong in this command?

Thanks in advance.