You can test the IDoc processing using the SAP Transction WE19.
Go to the SAP transaction WE19.
Select the Basic IDoc type FLCUSTOMER_CREATEFROMDATA,
and you will get the following screen.
Define the Sender and the Receiver by clicking on the
EDIDC line and save.
Enter the content of IDoc by clicking on the E1BPSCUNEW
line and save.
Click Standard outbound processing to process the IDoc
and send it to Talend SAP RFC Server.