1. Create DT, MT, MM, OM, SI in ESR or NWDS. Outbound Async SI for JBDC and Inbound Async SI for ABAP.
2. Create IFlow JDBC -> ERP, assign Business systems, configure and assign channels, assign interfaces and OM.
3. Activate and Deploy IFlow.
4. Generate, Activate and realize inbound method in Abap proxy.
You can do configuration withour Iflow, just with ICO in Integration Directory.
Each step 1,2,3 in detail - it is another big questions 