Solution : https://service.sap.com/sap/support/notes/1147151 (SAP Service marketplace login required)
Key words :
receive error message ff 786, tax reporting date, enhancement implementation vatdate_values_default_sap, method if_ex_vatdate_values~vatdate_check, error message, financial accounting, terms vatdate, badi vatdate_values, vatdate_determine reason, implemented note 1023317
Related Notes :
| 1137492 | Changeability of tax reporting date |
| 1023317 | Legal Change: Vat Due date |