The name of the field in the listname working list that determines whether a tree item has child items. This is only valid for unlevelled lists and will be ignored if listtype is "levelled".
Default value
'STD_CODE'
Valid values
The name of a valid field, in single quotes, that will contain a:
'Y' (the tree item has child items) or an
'N' (the tree item does not have child items).