How to store/get the Message variables from BO Method Exception (for ex: 9001) into task Container and then into Workflow container

Dear All

I am trying to find a away to store/import/get the sy-msgid, sy-msgno, sy-msgv1....v4 values from the BO Method

I am raising an exception in my Custom BO Method using the statement

EXIT_RETURN 9001 SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.

Now i want to get these Message variables into my Task Container and then bind into Workflow Container

How can i do that, Kindly Reply!