Clearing the error messages from buffer in GUI

Hi...

For an Order there are duplicated entries.So its giving errors as below.

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Example:  Item 601    -- completed

                Item 601   --   rejected

                Item 602    --  completed

                Item 602   --   rejected

I have deleted Duplicated item means which are rejected.

And i ran the CRM_MESSAGES_DELETE programe with order  and specific message-id  and number , but its not clearinng the messages(Its giving error message that Administrative item couldnot be found).

Any  solution.....to clear the above errors

Regards,

Mahesh