Solution : https://service.sap.com/sap/support/notes/142923 (SAP Service marketplace login required)
Key words : 
prerequisites program error solution source code corrections, additional key words vat, symptom process 1120 - field substitution, vat running number, countries thatnot thailand, field bkpf-xblnr, company code, field substitution, bkpf-xblnr, set country
Related Notes : 
       
| 128649 | Additional Info: Install/Upgrade Thai Version 40B |