>* 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)

try the following ... table.field ... syntax has always been questionable with REPLACE, sometimes it appears to work and other times it doesnt.

REPLACE prcpqtyby2t WITH THIS.LIST(THIS.LISTINDEX,1) IN prceng