>>>UPDATE. I found the cause of the problem. When the column name is greater than 10 characters, you cannot change it. Strange though that VFP allows creating a cursor with a column with the name greater than 10 char, but won't allow to change the name.
>>>
>>>Hi,
>>>
>>>I want to change a cursor column name. When I do it in the Command window, it works. Here is the code:
>>>

>>>cCursorName = "MyCursor"
>>>cFieldFrom = "FieldName1"
>>>cFieldTo = "FieldName2"
>>>alter table (cCursorName) rename (cFieldFrom) to (cFieldTo)
>>>

>>>So the above works without a problem in the Command window.
>>>
>>>But when I have pretty much the same code in the .PRG of the program, I get error:
>>>

>>>Error 1115
>>>Invalid Operation for the Cursor
>>>

>>>
>>>Could someone explain why? TIA
>>
>>How did you create the cursor?
>
>

>create cursor mycursor (description c(50))
>

>
>Note that the field name is greater than 10 char. And I could not change the name.

This is a bug for me, but why you need to rename the field in CURSOR?
Just create the cursor with the field names you want :-)