Creating a Key Figure Report with Constants 
SAP provides standard reports which you can use as a basis for defining your own reports. The name range for these predefined reports is 0SAPRATIO-01 to 0SAPRATIO-NN. You can not use names within this range for your own reports.
A screen headed Create Balance Sheet Report: Variables appears. Here you will find a list for valuation containing all variables which are defined in the forms. In the case of a key figure report only the variable fiscal year is displayed.
When defining the report you can determine, per variable, whether the variable is to be ready for input when the report is executed. To do this, mark the Enter at execution option. Leave the field "Variable value" blank. In the G/L reports within Financial Accounting you have the possibility of determining the variables and characteristics directly at the time of execution.
The values for the characteristics (e.g. which company code, which business area etc.) are also determined at the time the report is executed. Do not choose Characteristic values.