So I can see the IME is being triggered with WS-RM in the NWA sequence monitor, I can see the consumer has successfully received the message.
In the Developer Trace logs however, I find this error from location com.sap.glx.core.kernel.execution.ready.SemisimpleReadySet:
yield(Transition t, int flags):Transition TRIGGER_INTERMEDIATE_MESSAGE_EVENT_Interrupt(Request{5631ad34-f080-11e2-ceaa-0000001597ee/5631ad34-f080-11e2-ceaa-0000001597ee}(milklink.com/plm/pr/changecontrol/DataGatherProcessEnd,DataGatherEnd,null,null)[matched, refCount=0], Event_0_Interrupt_4269bf13fdf37c3fcfb4b6e865c86d1d{5631ad34-f080-11e2-ceaa-0000001597ee/56322264-f080-11e2-a4d6-0000001597ee}(Request{5631ad34-f080-11e2-ceaa-0000001597ee/5631ad34-f080-11e2-ceaa-0000001597ee}(...)[matched, refCount=0],SAP_BPM_Service,b684e91d397e50f9f2b756e9281446a7,b84fde72-f07c-11e2-acb8-0000001597ee)[matched, refCount=0], Subscription_0_Interrupt_4269bf13fdf37c3fcfb4b6e865c86d1d{b86f33a6-f07c-11e2-cfd0-0000001597ee/b96e226e-f07c-11e2-c651-0000001597ee}(Instance_0_Data_Gathering_Process_4269bf13fdf37c3fcfb4b6e865c86d1d{b86f33a6-f07c-11e2-cfd0-0000001597ee/b96ad09c-f07c-11e2-b6a1-0000001597ee}(...),b84fde72-f07c-11e2-acb8-0000001597ee,1), WheelLockGhost[565f70d0-f080-11e2-81dd-0000001597ee, Subscription_0_Interrupt_4269bf13fdf37c3fcfb4b6e865c86d1d{b86f33a6-f07c-11e2-cfd0-0000001597ee/b96e226e-f07c-11e2-c651-0000001597ee}(Instance_0_Data_Gathering_Process_4269bf13fdf37c3fcfb4b6e865c86d1d{b86f33a6-f07c-11e2-cfd0-0000001597ee/b96ad09c-f07c-11e2-b6a1-0000001597ee}(...),b84fde72-f07c-11e2-acb8-0000001597ee,1)], Token_0_Data_Gathering_Process_4269bf13fdf37c3fcfb4b6e865c86d1d{b86f33a6-f07c-11e2-cfd0-0000001597ee/b9973458-f07c-11e2-ba69-0000001597ee}(Instance_0_Data_Gathering_Process_4269bf13fdf37c3fcfb4b6e865c86d1d{b86f33a6-f07c-11e2-cfd0-0000001597ee/b96ad09c-f07c-11e2-b6a1-0000001597ee}(...),1,null,null,null), Instance_0_Data_Gathering_Process_4269bf13fdf37c3fcfb4b6e865c86d1d{b86f33a6-f07c-11e2-cfd0-0000001597ee/b96ad09c-f07c-11e2-b6a1-0000001597ee}(Instance_0_Minor_Change_Process_8a2529d8960624eaeaf3ac11c2f21602{b86f33a6-f07c-11e2-cfd0-0000001597ee/b86f33a6-f07c-11e2-cfd0-0000001597ee}(...),null,Token_0_Minor_Change_Process_8a2529d8960624eaeaf3ac11c2f21602{b86f33a6-f07c-11e2-cfd0-0000001597ee/b95ded35-f07c-11e2-b750-0000001597ee}(...),false), Context_6_taskStatus_4269bf13fdf37c3fcfb4b6e865c86d1d{b86f33a6-f07c-11e2-cfd0-0000001597ee/b96b9068-f07c-11e2-9d1d-0000001597ee}(Instance_0_Data_Gathering_Process_4269bf13fdf37c3fcfb4b6e865c86d1d{b86f33a6-f07c-11e2-cfd0-0000001597ee/b96ad09c-f07c-11e2-b6a1-0000001597ee}(...),Scope_3_Data_Gathering_4269bf13fdf37c3fcfb4b6e865c86d1d{b86f33a6-f07c-11e2-cfd0-0000001597ee/b96b8226-f07c-11e2-a609-0000001597ee}(...),0,false,false,null), Context_3_taskComments_4269bf13fdf37c3fcfb4b6e865c86d1d{b86f33a6-f07c-11e2-cfd0-0000001597ee/b96c7fae-f07c-11e2-cb7d-0000001597ee}(Instance_0_Data_Gathering_Process_4269bf13fdf37c3fcfb4b6e865c86d1d{b86f33a6-f07c-11e2-cfd0-0000001597ee/b96ad09c-f07c-11e2-b6a1-0000001597ee}(...),Scope_15_Data_Gathering_4269bf13fdf37c3fcfb4b6e865c86d1d{b86f33a6-f07c-11e2-cfd0-0000001597ee/b96c7fad-f07c-11e2-b905-0000001597ee}(...),0,false,false,null)) has reached the maximum number of retries 100 due to transient errors.
And
com.sap.glx.core.kernel.execution.ready.SemisimpleReadySet
yield(Transition t, int flags):Transition BLACK_HOLE(Subscription_0_Interrupt_25c3bc77f26e2efe4fd829817c51fea7{fcc97958-ab28-11e1-a889-0000001597ee/b7da8357-ab2a-11e1-a8dc-0000001597ee}(null,49e9b883-ab27-11e1-a2ab-0000001597ee,1)) has reached the maximum number of retries 100 due to transient errors.