Add a Message Standard Lookup Code
You can add a message standard lookup code for an external message definition.
Here's how you add a message standard lookup code:
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            In the Setup and Maintenance work area go to the Manage Standard Lookups page and search for the Lookup Type ORA_CMK_EXT_MESSAGE_STANDARD. 
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            In the ORA_CMK_EXT_MESSAGE_STANDARD: Lookup Codes section, click Actions > New and add your message standard. 
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            Click Save and Close.