Solution : https://service.sap.com/sap/support/notes/579417 (SAP Service marketplace login required)
Key words : 
solution create module cnif_guid_network_maintain, create include lcjdwfgu, import parameter aufnr_single, development class cn, attached program corrections, red traffic lights, guid function, caufv-aufnr, default space, transaction scwb
Related Notes : 
       
| 607000 | Required notes for PS-BAPIs | 
| 587916 | Connecting the GUID function 2 |