To enter a transaction code and start a task:
As of Release 4.6, the command field is closed by default. To display it, choose the arrow to the left of the Save icon: .
The command field appears:
To hide it, choose the arrow to the right (outside) of the field.
To display a list of the transactions you used last, choose the dropdown arrow at the right-hand end of the command field.
For example, for Transaction code MB01, you would enter/nmb01 , as shown here.
You exit the current task, and the initial screen of the new task appears.
If you do not want to end your current task, but you need to do another task, you can create a new session.
For example, suppose you are creating a purchase order and you need to look at a table with exchange rates. You can open a session to look at the exchange rate table without having to end your first task of creating a purchase order.