I remember running into this bug in VFP3. I am not near VFP6SP3 at the moment, so I can't verify the behaviour. Perhaps it hasn't been fixed yet. I would report this as a bug.

>* This does not work, no error gets shown, but the replace command
>* does not put anything in the field
>REPLACE prceng.prcpqtyby2t WITH THIS.LIST(THIS.LISTINDEX,1)
>
>* This works
>SELECT prceng
>REPLACE prcpqtyby2t WITH THIS.LIST(THIS.LISTINDEX,1)
>
>Is this a bug, feature, or my misusing a replace on a table that is not selected?