You cannot ALTER cursor with long filed name (longer than 10 characters). You can UNION cursors with memo fields if you can use UNION ALL.

>What would prevent me from altering the structure of a readwrite cursor?
>
>In two different locations in my application, I am creating a readwrite cursor and then dropping the memo fields because I later want to do a union and you can't union cursors with memo fields.
>
>I know several work arounds, but I am puzzled since dropping a field works fine in one instance and is failing in another.
>
>So here is some sample code:
>
>

>* mhistory here is the memo field
>select cfirst, clast, mhistory ;
> from customer ;
> where clast = "Brown" ;
> into cursor cur_selectedcustomers ;
> readwrite
>
>alter table cur_selectedcustomers drop column mhistory
>

>
>The error I am getting is: Invalid operation for the cursor (Error 1115)
>
>Which from the VFP help is: An attempt was made to use the PACK command on a cursor.