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我們要在Report裡使用Profile有三件事情要先做

1.在User Parameter裡建立一個新的參數叫做P_CONC_REQUEST_ID
2.在Before Report Trigger裡呼叫 FND SRWINIT

FUNCTION beforereport
    RETURN BOOLEAN IS
BEGIN
    BEGIN
        srw.USER_EXIT('FND SRWINIT');
    EXCEPTION
        WHEN srw.user_exit_failure THEN
            srw.MESSAGE(3001, 'Error in SRWINIT');
            RAISE;
    END;

    RETURN (TRUE);
END beforereport;

3.在After Report Trigger裡呼叫 FND SRWEXIT

FUNCTION afterreport
    RETURN BOOLEAN IS
BEGIN
    BEGIN
        srw.USER_EXIT('FND SRWEXIT');
    EXCEPTION
        WHEN srw.user_exit_failure THEN
            srw.MESSAGE(4001, 'Error in SRWEXIT');
    END;

    RETURN (TRUE);
END afterreport;

Reference
https://docs.oracle.com/cd/E26401_01/doc.122/e22961/T302934T458255.htm
https://docs.oracle.com/cd/E18727_01/doc.121/e12892/T354897T361281.htm

原因:The oracle standard report always use srw.user_exit ('FND SRWINIT') to get the previous session  information depend on p_conc_request_id, and set the client session to be the same OU.Because the application is difference session with concurrent program.If you use fnd_profile.value(...) to get the profile.You  may get the same OU  ,eventhough  you  change  OU.  You can also get the correct  OU by using definitoin of parameter  to pass in report.