Multimapping for two different adapters

Hi ,

I have a scenario where 1:n mapping needs to be done and used multimapping without BPM.

I am facing issue in configuration

1. if PO accepted then idoc posts to ECC

2. if PO rejected then it should go and update a table through ABAP proxy and also an email needs to be triggered with the rejection data.

while trying to test, it is throwing the below error

<SAP:Stack>At least two of the sub messages deal with different Adapter Engine types. Check the channels</SAP:Stack>

your help will be appreciated.

Thanks

Sar