Actually it is supported in JCA Adapter after PS15:
https://support.oracle.com/epmos/faces/ui/km/SearchDocDisplay.jspx?_afrLoop=463879445991047&type=DOCUMENT&id=1488236.1&displayIndex=1&_afrWindowMode=0&_adf.ctrl-state=vw6j43fr9_83 BRM now adds multischema support when integrated with external applications using Oracle Application Integration Architecture (Oracle AIA).
I check the link shared by user10634005 but I think that only the search supports the multischema. Can you explain me where is the dynamic code to create a customer in one specific schema?
For example the SyncCustomerPartyListEBM_to_PCM_OP_CUST_COMMIT_CUSTOMER.xsl and SyncCustomerPartyListEBM_To_PCM_OP_CUST_UPDATE_CUSTOMER_inputFlist.xsl have hardcode the value 0.0.0.1 it means that the customer will be always created in the same schema?