Resolution: In order to have multiple JDBC connection resources, specify the JDBC connections used by the engine.You can add the be.dbconcepts.dburi property into the engine's TRA file,then provide a comma delimited list of the connections (using their project path).
Example:
be.dbconcepts.dburi=/SharedResources/Con/JDBC/DataSource_1.sharedjdbc,
/SharedResources/Con/JDBC/DataSource_2.sharedjdbc
Refer to the BE 3.0.1 HF4 readme 1-9LQQJ1 for more details.