Solution : https://service.sap.com/sap/support/notes/1111097 (SAP Service marketplace login required)
Summary : 
      This SAP Note addresses the process for activating functions related to the EA-FINSERV extension in SAP ECC. Users questioning the necessary switches to enable for utilizing EA-FINSERV functions will find that only the EA-FS switch should be activated. Activation of the EA-FIN switch isn't required as functions enabled by EA-FS and EA-FIN operate independently. The note also clarifies terminology associated with enterprise extensions and business functions within Financial Services.
Key words : 
financials extensionactivate sap ecc extensions reason, terms ea-fs, switch ea-fs, switch ea-fin, extention ea-finserv, switches ea-fs, extension ea-finserv, ea-finserv, extension switches, enterprise extension
Related Notes : 
       
| 965032 | Differences between old and new depreciation calculation | 
| 588364 | Prerequisites for activating extensions |