While switching across screens there is always a hazard of entering data into the production client by accident....
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To avoid this, change the appearence of the production screen so you don't get the two mixed up.
How to do it? Simple:
Log in > Customizing local layout (ALT+F12) > Set color to system (select color) > Save
Easy as that! Note that this only works with newer versions of SAP GUI, however.