Entering Value and Formula Variables in a Set 
A dialog box appears, asking you to enter the name of the variable.
The variable must use a dimension that is compatible with the dimension of the basic set you are creating or changing.
From the dialog box, you can create the variable if it does not yet exist. You can also change and display an existing variable. The system then branches to the respective transaction.
The Create Set: Basic Entries screen appears, displaying the variable in the set line you selected.