Hi Radhika,
I thought I would recheck your statement about s/4 since I looked at note 2178368 and figured there was no reason this wouldn't work in standard ERP; so I created a new gateway service, manually created a basic annotation file and stored it accessible to Fiori; and after the swfvisu configuration (and a lot of debugging to work out why it wasn't working) it worked fine! What was even more suprising was the old IBO_INBOX could continue to use the Web Dynpro configuration, while My Inbox used the UI5 configuration!
The only aspect which is confusing (due to lack of doco currently) is the standard annotation issue of not knowing how the annotations are laid out specifically for each smart "object".
Anyway, just waiting on basis to install SP02 so I can try out the UI5 version which is obviously more flexible but is there any reason I shouldn't use this on ERP 6?
BTW- The note (and other doco) refers to the wrong application path /sap/opu/odata/sap and should be /sap/bc/ui5_ui5/sap/ca_fiori_inbox/annotationBasedTaskUI (at least for non S/4 it does).
Cheers,
Matt