Without an external development toolkit, there is no easy way to introspect the difference between inbound and outbound tables in JCo. You could build your own development framework, but you might want to check out the Java Connectivity Builder (JCB) that comes with the SAP J2EE standalone server. The JCB offers a graphical interface for browsing and generating easy-to-use proxy classes that sit on top of the Java connector.
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