How to perform UPDATE/INSERT

Hi,
How can i perform update/insert we do in OWB, which insert records if they are not available in target and updates them if they already exists.
I am now using IKM Oracle Incremental Update(MERGE)
but i am getting some error while execute
VSG

Here is the error.
com.sunopsis.core.SnpsInexistantObjectException: There is no connection for this logical schema/context pair:RDDM_LOGICAL / STGDW_LOGICAL
     at com.sunopsis.dwg.dbobj.SnpConnect.getSnpConnectByLSchemaNameAndContext(SnpConnect.java)
     at com.sunopsis.dwg.dbobj.SnpConnect.getSnpConnect(SnpConnect.java)
     at com.sunopsis.dwg.dbobj.SnpSession.getDwgConnectLst(SnpSession.java)
     at com.sunopsis.dwg.dbobj.SnpSession.getConLst(SnpSession.java)
     at com.sunopsis.dwg.dbobj.SnpSession.treatSession(SnpSession.java)
     at com.sunopsis.dwg.cmd.DwgCommandSession.treatCommand(DwgCommandSession.java)
     at com.sunopsis.dwg.cmd.DwgCommandBase.execute(DwgCommandBase.java)
     at com.sunopsis.dwg.cmd.e.i(e.java)
     at com.sunopsis.dwg.cmd.g.y(g.java)
     at com.sunopsis.dwg.cmd.e.run(e.java)
     at java.lang.Thread.run(Unknown Source)

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Hi Gurus,
I got Assignment & need your help how to write this procedure efficiently.
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Message was edited by: Rado
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How to perform UPDATE/INSERT

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