3.2.3.5.2 RPC PDU Received

An RPC PDU MUST be received from the client only and MUST NOT be received from the server. If the RPC PDU is received on an IN channel from the server, the inbound proxy MUST close the IN channel to the server and the IN channel to the client for the virtual IN channel to which the IN channel to the server belongs.

If the PDU is received from the client as specified in section 2.1.2.1.7, an implementation of this protocol MUST forward it to the server using the default IN channel and conforming to flow control provisions as specified in section 3.2.1.4.1.2.