The FOR EACH loop provides 'read-only' accesss.
In case of arrays, it's the same as

*FOR EACH scode IN thisform.aStatuscodes
FOR i=1 TO ALEN(thisform.aStatuscodes)
	scode = thisform.aStatuscodes[i]
...

>

>SELECT key1,key2 FROM lookup WHERE typename="ECO-STATUS" ORDER BY key2 INTO ARRAY thisform.aStatuscodes
>FOR EACH scode IN thisform.aStatuscodes
>	scode = TRIM(scode)
>ENDFOR

>
>My expectation was that scode would now be reflected back into the form's array property. I can see scode changing each time, but when the loop is done, the array is unchanged.
>
>I know I how to re-write this using ALEN(), but could somebody explain why the FOR-EACH code is not working and how to use it to update the values in the array?