I have the following segment of code:

WITH This

  SELECT FSPrefs
  SET ORDER TO RowId
		
  LOCATE FOR ProductId = .nProductId AND;
                         RowId = cRowId AND;
                         OptionNo = nOption

  IF FOUND()
    *** Some code here
  ENDIF

ENDWITH

This errors out saying 'nProductId not found'

If I include the 'This' statement in front if the 'nProductId' property, it
works fine:

WITH This

  SELECT FSPrefs
  SET ORDER TO RowId
		
  LOCATE FOR ProductId = This.nProductId AND;
                         RowId = cRowId AND;
                         OptionNo = nOption

  IF FOUND()
    *** Some code here
  ENDIF

ENDWITH

Anyone know whats going on here?