Hi,
I checked and due to distribution of amount to different accounts and GR non valuated status, MIGO will not able to post with Collective slip. Check the same below thread and also refer notes available.
http://scn.sap.com/thread/1101316
Note
442706 - MIGO: No individual slip for multiple account assignment
015790 Cancellation RV_MESSAGE_UPDATE with TD456 : page
522591 FAQ: IM output determination