How can I hide record set lookup codes of custom objects?
To disable a custom record set lookup code of a custom object, do the following:
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            In the Setup and Maintenance work area, go to the following: - 
                  Offering: Sales 
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                  Functional Area: Sales Foundation 
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                  Task: Manage Standard Lookups The Manage Standard Lookups page opens. 
 
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            In the Lookup Type field, enter ORA_ZCX_SRCH_RECORD_SET, which is the custom objects search record set filter. 
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            In the Lookup Codes section, go to the lookup code that you want to disable and clear the check box in the Enabled column.