Only instances registered with the SUBTREE_MANAGER or EVENT_HANDLER capabilities are permitted to use the source override feature on requests and responses. For the EVENT_HANDLER application program (there may be only one), any distinguished name may be specified as the source, with no restrictions. But for subtree manager application program s, there is a restriction placed on the distinguished names which may be specified. The restriction is that the distinguished name must be within the subtree managed by the subtree manager, i.e. the distinguished name specified as the source must have the distinguished name of the subtree as a prefix. This error is returned when a subtree manager specifies a source outside its managed subtree.