Solution : https://service.sap.com/sap/support/notes/201753 (SAP Service marketplace login required)
Summary : 
      SAP Note discusses implementing the Australian Business Number (ABN) in the R/3 system, following statutory requirements. The solution involves using the STCEG field to store the ABN number, adjusting settings in the country table for Australia, and ensuring specified checks in transaction OY17. Additionally, instructions include creating a message AR018, function module ABN_NUMBER_CHECK, and function module FI_CUSTOMER_STCEG_READ to manage ABN checks and validations efficiently. The note also revises the implementation in specific includes and source code changes, with emphasis on handling VAT registration and validating tax numbers per Australian standards.
Key words : 
type proposal optional referencei_head_kunnr    kna1-kunnri_head_kna1      kna1                        xi_branch_kunnr  kna1-kunnr                  xi_branch_kna1    kna1                        xi_t001          t001                        xi_t005          t005                        xchanging parametr ref, type proposal optional referencei_bseg            bsegi_bsez            bsezyou, australia               import parameter reference type               i_abn_number, customer masterimport parameter ref, prerequisites statutory requirements solution, reference type pass, additional key words abn, create function module fi_customer_stceg_read, vat registration number field, derive eu tax number
Related Notes : 
       
| 321819 | No-ABN Withholding Payment Summary for AUSTRALIA | 
| 314011 | PAYG Voluntary Withholding Payment Summary for AUSTRALIA | 
| 312924 | Deactivate Tax number check | 
| 306529 | ABN: Posting to a ONE-TIME account | 
| 216761 | RFUVDE00: Termination with error message F7 212 | 
| 216359 | Australian GST: Simplified BAS reporting | 
| 216109 | GST - Simplified ERS reporting | 
| 215964 | FB01/FB70: Cash discount base amount not set | 
| 212933 | Error F2013 'Country &1 not defined in system' | 
| 211354 | Rounding withholding Taxes in Australia | 
| 208810 | RFUVDE00: rounding of base amounts not required | 
| 204972 | RFUMSV00: Deactivating document summarization (BSET) | 
| 203365 | BAS - Report for processing the GST in Australia | 
| 202730 | ERS processing for GST tax Australia | 
| 168188 | GST Information Note | 
| 122332 | RFUMSV00 Wrong transaction key for n.ded.input tax | 
| 73699 | VAT registration number check in Greece and Finland |