Try to get the login user name in the field of database

I have an Apex application with 4 tables. Each table has its individual fields more audit 4 fields (CR_DATE, CR_USER, LM_DATE, LM_USER) to follow, create and edit events Records.
We use authentication database for the application of the Apex, each user has his own connection to the database ID.

Our standard development efforts resulted in a practically useless 'APEX_PUBLIC_USER' entry in our areas of audit.
Manual change of our triggers (by Toad) solved this problem. However, a business rule States that all the requirements of design of database are stored in Oracle Designer and manual trigger changes are not an option for us.

So, we have posted on the forum of designer asking a way to make this change in the designer
link:Re: manual trigger changes are not retained when the API is generated (re)

I made the suggested changes and were able to verify that these changes work if I change records using Toad, but don't work not by Apex. It seems that I have the login name used by the server instead.
(for example if I connect on the toad as a generic user and edit a record, my personal user name appears correctly in the field of the LM_USER - if I change a record through the Apex, connected applicaton as myself, the area of the LM_USER says 'oracle')

I tried to change the source of the LM_USER field in the Apex to pull the value of APP_USER, but it seems to be crushed (or substitute) by the triggering action.

The goal is to have the usable information audit trail field on the user who performed an action, if possible based on the: value APP_USER in Apex, which is also the oracle username.

Hello:

You might want to reference "CLIENT_INFO" rather than "OS_OUSER" in the trigger, code generation and check if it helps. APEX defines CLIENT_INFO APP_USER for each database request.

CASE
   when  SYS_CONTEXT('USERENV','CLIENT_INFO') is null then
       cg$rec.CREATED_BY
   else
     SYS_CONTEXT('USERENV','CLIENT_INFO')
END

CITY

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    US aircraft problems try to get the APEX listener running in stand-alone mode on AIX, but that did not work.

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