One Sender system (sync) and two receivers system(Sync) . Pls help

Hello All,

For one Sender system (sync) and two receivers system(Sync)

as I am using BPM for it.

CRM sender system (RFC)

DM (RFC) and ERP Receiver systems (RFC)

Pls let me know

In Receive there is only two mode

1. Async

2. Open S/A bridge

So do i need to choose Async mode for sender RFC.

Pls tell me the BPM flow steps for my scenario

Regards