It is not advisable to use CX_ROOT directly and you would require using one of its direct subclasses. Also, the propagation depends upon the exception subclass hierarchy.Subclasses of CX_STATIC_CHECK – these do not propagate automatically. You will need to do the handling yourself or there will be a syntax error in the program.Subclasses of CX_DYNAMIC_CHECK – these do not require any handling. But the program that does not handle the exception will be aborted with these subclasses.Subclasses of CX_NO_CHECK – These will get propagated automatically if the exception is not handled.

I would suggest you to use below instead of JCO_AHOST and JCO_SYSNR:Use JCO_R3NAME with system ID of the target hostUse JCO_MSHOST with message server host name or IP addressUse JCO_MSSERV with message server port numberUse JCO_GROUP with the name of the logon groupYou can refer to below link to check a working example:https://sourceforge.net/p/rcer/git/ci/master/tree/net.sf.rcer.conn