Solution : https://service.sap.com/sap/support/notes/842109 (SAP Service marketplace login required)
Key words :
system throws error message 8a- 770, symptom offical document number, terms offical document number, offical document number, pre requisite note 831870, fi transaction fb75, transaction fb75, fb75 transaction, credit memo, debit memo
Related Notes :
| 833991 | Offical Document Number getting generated for NON-VAT state. |
| 833318 | Change to user exit 'changing paramter' for 40B release only |
| 832503 | Official document number loss after message display |
| 831870 | Offical document numbering changes for VAT 2005 |
| 818732 | Master Note for VAT 2005 |