Solution : https://service.sap.com/sap/support/notes/115742 (SAP Service marketplace login required)
Key words :
system generates error message sk608, additional key words kna1-telfx, customer/vendor master data, incorrect fax number entry, fax number starting, message type, lfa1-telfx, fax number, 'invalid number', fax numbers
Related Notes :
| 495234 | Termination during message output due to incorrect fax no. |