Solution : https://service.sap.com/sap/support/notes/1050530 (SAP Service marketplace login required)
Key words : 
rfc-enabled function module bca_in_acc_sl_lc_get_balance, relevant support package, required xi release 7, manual advance correction, account management system, missing function, standard system, terms account, xi technology, correction instructions
Related Notes : 
       
| 1050808 | CMS integration with other components via RFCs | 
| 1049351 | SAP Banking Services 5.0 SP02 | 
| 1024091 | Release limitations concerning SAP Banking Services 5.0 |