What happens when SAP Adapter crashes

Hi all,

I would like to an implement asynchronous interface between SAP and wM. In the case that I have 2 SAP adapters (wmA and wmB), what happens if after wmA sends an IDOC to SAP, wmA crashes? Can SAP detect the failure and send the reply to wmB?

I would appreciate any advise on the best method to implement a redundant asynchronous interface between SAP and webMethods.

Many thanks in advance!

Cheers,
Ben