First of all, ETB_TIMEOUT denotes the transport timeout, i.e. how long the stub will wait for a response to a request from the opposite site.
For the 00740074 response, if I were you, I would take a look at the documentation, which says:
00740074 Wait Timeout Occurred
Explanation The period specified by the WAIT field in the API has elapsed without any reply or request arriving to satisfy the Broker call. The conversation still exists and can continue.
Action Check the following situations:
In a RECEIVE for servers, this is an information message when not waiting for a specific conversation. No request is available for processing. The RECEIVE is normally issued again.
When this occurs for a specific conversation, a RECEIVE can be issued to wait again for the data/message, or the conversation can be aborted with an EOC call.
When this occurs in a client in non-conversational mode, the call can be retried.
Check if the partner is working correctly.
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