Solution : https://service.sap.com/sap/support/notes/1293848 (SAP Service marketplace login required)
Key words :
system issues error message ff 786, longer issues error message ff 786, tax reporting date, posting date, document date, ac interface, terms vatdate, form document_change, performance reason, solution implement
Related Notes :
1409792 | Retaining tax reporting date even if tax base is zero |
1404919 | Performance of BAdI VATDATE_VALUES and TAX_EXCHANGE_RATE |
1232484 | How to use the VAT due date, tax reporting date VATDATE |
1023317 | Legal Change: Vat Due date |