This indicates that an application program (local or remote) tried to re-use an invoke id that has not yet been completed. CMIP services does not time out invoke ids or re-use invoke ids in any way. But an application program can specify its own invoke ids, or the remote application program may be using a stack other than CMIP services which does time out and re-use invoke ids. In this event an outstanding invoke id, which has not yet completed processing may be re-used by an application. This is an error. The CMIP standards do not provide a way for invoke ids to be timed out therefore CMIP services does not time them out. The most likely cause of this problem is that the local application program is either taking to long to process the message or has an error, and the remote requester times out the invoke id then tries to re-use it.