Yes, fields names. Somehow, it is working now, I was probably missing one if fields with a longer name.

Thanks for help.
>Not fields, field names.
>
>>I have changed all fields to be less or equal 10 chars. But the command still does not work.
>>
>>>Yes if you make field names in a cursor less or equal 10 characters than you can apply ALTER TABLE.
>>>
>>>>So, if I make all fields less then 11 chars it would work?
>>>>
>>>>>The ALTER TABLE command is not supported on cursors with long field names (longer that 10 characters).
>>>>>
>>>>>>I am trying to ALTER a cursor that has a logical field to numeric. The cursor is readwrite. When I issue:
>>>>>>ALTER TABLE cursorname ALTER COLUMN fieldname I
>>>>>>then I am getting "Invalid operation for the cursor".
>>>>>>But if I browse that cursor, then go to Properties and manually change one of the fields type, then after this I can run my command with no problem. Why it is working that way?