I’d want a look at how that connection is configured becuase it’s not really correct to say that you get replies as data messages sometimes. What’s really happening is that the remote system is sending messages that have a format of a reply at a time when your thread isn’t waiting for replies. The engine decides to store a message as type reply if it was waiting for replies. The engine stores a message as type data if it wasn’t waiting for replies.
That means that it won’t do any good to change your check ack procedure because it’s located in inbound replies and the data messages are being processed in inbound data.
So, how could a reply message enter as a data message? If the timeout value for await replies is too short or the remote system is sending unsolicited replies.
