How to change the default logon client on SAPGUI Logon Screen

By default after an installation of a system, SAP GUI will begin with the client 001.

Logon screen SAPGUI

For change this configuration, we will modify the next parameter:  Login/system_client

This parameter is not dynamically switchable, so, if you change his value, you need restart the system to take effect the changes. For check if a parameter is or not dynamically switchable, you can go to transaction RZ11, put the name of the parameter and see if the option “Dynamically Switchable” is selected:

Transaction RZ11

Now, for modify the value of this parameter, you must be use the transaction RZ10:

1. Select the instance profile.
2. Select the edition mode: “Extended maintenance”
3. Press the button: “Change”

Transaction RZ10

You will see a list with the parameters in the instance profile. For add a new parameter, press in the button “Create” located in superior menu:

Superior Menu of Transaction RZ10

Follow the next steps:

1.     Put the parameter name: login/system_client
2.     Put the client number you will use default when the SAPGUI logon screen start.
3.     Press the button "Copy"

Transacction RZ10 - Create Parameter

Come back and save the changes:

Transacction RZ10 - Save Changes

When you come back to the initial screen of RZ10 transacction, you can see the instance profile with the status "Not Saved":

Initial Screen - Transacction RZ10

For save and activate the changes, follow the next steps:

     1. In the superior menu, select the "Save" option:

     2. Select "Yes" for activate the new instance profile:

     3. You can see a message with confirmation for the changes:

     4. The next message tells you about restart the system for the changes take effect:

     5. Again in the initial screen of RZ10 transaction, you can see the new version of instance profile:

Finally, when you start the logon screen of SAPGUI, you can see the new client number set in the login/system_client parameter, in this case, the client number is 100:

SAPGUI Logon screen

It's a simple thing, but is so helpful when you do it your first installation

Best regards from Chile

@Fepezoabarca