made a mistake in a tag and message set to delivering. Not able to send any more messages. 
My Business system is AS ABAP, so is my technical system and sending Business is 3rd party.
Dunno where there erro could be.
I have restarted J2ee to be sure the cache updates are in place.
Now trying to replicate the MM, OM and then assign it in ICO to ensure separate queue is built up.