Solution : https://service.sap.com/sap/support/notes/1420187 (SAP Service marketplace login required)
Key words : 
archive customer-specific enhancements, terms payment item enhancement, standard objects, afx_global_cust reason, attached document, archiving function, banking services, enhancement, ar_factory, prerequisites
Related Notes : 
       
| 1430709 | Enhancements of Enterprise Services within Banking Services | 
| 1418944 | Customer-specific enhancements for payment items | 
| 1418943 | Banking Services from SAP - additional information |