Name or password is incorrect (repeat logon)

You get this message "Name or password is incorrect (repeat logon)" when doing an authorization test for RFC on to ERP2005 or higher. You are using a SAPgui controls that cannot handle case-sensitive passwords. The SAPgui controls convert the password into upper_case.
I experienced this problem for my RFC from BW (BIWREMOTE) into ERP2005.
Solution: Change the password for this user in the target system (the system you try to reach) to only upper-case. Another solution is to install the absolut latest of SAPGui. I have 7.10, but still got this problem....

OB52 - Not modifiable in QA system

You have the possibility to do changes when you access OB52 in Production system.
But when you access transaction OB52 in the QA system you receive this message:
Client 100 has status 'not modifiable'

Reason: In SCC4 the Client Role for this client in QA system is set to "Test". If you change it into "Production" you will have possibility to do changes in OB52 (S_ALR_87003642). Remember to change it back when you are finished.

Another solution is described in note 214132. But this solution was no good for me.