When connecting to SAP through Oracle SAP Adapter in Oracle BPEL, the data of Chinese characters inserted into SAP from BPEL is unreadable. But those data in BPEL is correct.
After checking the whole environment, we noticed that the JVM of OC4J Container running SAP Adapter doesn't contain the encoding parameter.
Here we made the below changes on OC4J JVM settings:
Then it worked properly.