Solution : https://service.sap.com/sap/support/notes/495234 (SAP Service marketplace login required)
Key words : 
longer catch return code invalid_fax_number, incorrect fax numbers exist, output program terminates, purchasing print program, incorrect fax number, longer create, fax number, fax message, symptom entries, vendor master
Related Notes : 
       
| 503565 | Incorrect fax numbers are accepted | 
| 309854 | ME9F:Progrm termintn "Parameter DEVICE= is invalid" | 
| 115742 | Termination SK608 for fax number starting with '+' | 
| 102303 | Termination SK608 for invalid FAX number |