Previous Month - Variable

Matez,

I use variable 0RMA_FIP(Fiscal Year/Period) to get User Input for a Current Month.

Now, using this user-input variable for Current Month, the Report is expected to also display a values of <b>Previous Month</b>

Is there any standard variable given by SAP for this Previous Month ? Or if there isn`t could you explain how can I create this variable to be "Current Month -1" ?