I am also facing the same issue but difference is that i am using generic Idoc routing flow (having ALE SAP adapter in pass through mode) which routes the unparsed Idocs to respective processing flow ...
We have 2 Queue Managers QM1 and QM2. Both are in same cluster. Following queues are defined on these 2 qmgrs. app1 and app2 are 2 application ids which own their respective queues.