There is no SAP DM for deposit management. What SAP ERP has is a module called "Treasury and Risk Management" where you can manage you external and internal investments and loans. The are is called "Money Market". Beside Money Market you also have:
The license depends on the usage of the different modules.
I think Prasath was referring to SAP Banking — Deposits Management (training FS260, FS242, etc.)
The solutions is available as "SAP Deposits Management rapid-deployment solution" with a quote price, for the implementation of $237,500 USD.
You should be able to find it (if you have it active) under SPRO > SAP Banking
You can find also more information about the SAP Banking — Deposits Management on the SAP for Banking - Master Guide 2011 document (page 41) that you can find at http://service.sap.com/instguides > Industry Solutions > Industry Solution Guides > SAP for Banking > Solution Guides