DMOD limited to 4 Non-RPC Callbacks for API Libraries

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When an application needs to perform its own routing of received messages, the DMOD adds the specified procedure to a list of procedures called whenever a message is received.

The following example will illustrate a failing situation:

When an application issues the following function calls, the sequence of registring callback routines is as follows:

   RPC registers a callback, rout_cnt (the count of callbacks
      registered) = 1
   RUI registers a callback, rout_cnt = 2
   CSV registers a callback, rout_cnt = 3
   APPC registers a callback (for conversation verbs), rout_cnt = 4

   APPC tries to register another callback (for DISPLAY & CNOS management
      verbs)
				

The DMOD fails this request and the DISPLAY verb fails, because it already has four callbacks registered.