SXMB_MONI - weird message "Acknowledgement not possible"

Hi All,
I Am working on an async scenario of:
ERP -> IDOC -> XI -> PlainHTTP -> 3RDPARTY
I have now got the original message doing all that I want it to, I create it in the ERP system, it goes through XI and ends up at the right place. But I had a few problems with Acknowledgements. First off I had the seemingly infamous "Unable to convert the sender service to an ALE logical system" error, but by searching through the forum and some useful weblogs (thanks Michal..) was able to sort this out (still find it far from obvious that a 3rd party system needs an LS..).
And now my ALE Ack is (seemingly) successfully going back into my ERP system and if I look with Transaction WE05 it says it was processed successfully (code 53, using process code AUD1), plus in the RWB the acknowledgement is shown as having been processed successfully, but SXMB_MONI still shows the icon and message "Acknowledgement not possible" in the list of XML messages, although when I look at the details there are no errors... it is weird and I am tempted to ignore it as it does not seem to be causing any issues but I would love to know why it still displays this message.. any ideas?
Many thanks,
Chris

Hey,
Thanks Udo, I kind of suspected that it was ignorable but it is always nice to see only green lights and clean messages in RWB... So I will move on.. but am still a little confused though, as to what it means to say that acknowledgements are not supported? I can see that an acknowledgment is being created, sent and accepted back into the Sender system (which suggests a certain level of support for acknowledgements..)
So does that mean there are further acks that could/should be sent but are not supported? The acknowledgment documentation I have found does not seem clear on this. Perhaps I am getting the Ack from the IS but not from the plain Http adapter??
Many thanks for your help,
Chris

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