Try

laArray[i,j] = ICASE(TYPE("laArray[i,j]") = "O", NULL, TYPE("laArray[i,j]") = "L", .F., CAST("" AS (TYPE("laArray[i,j]"))))

>
>What's the best way to EMPTY an array element, regardless of datatype, without messin' with the structure?
>
>Thanks.
>Luke