For what it's worth, here is an extract from Pastel's help documentation, regarding this issue:
In South Africa there are certain requirements for businesses who wish to issue tax invoices, debit notes and credit notes in electronic format instead of the traditional paper version (hard copy).
The customer or intended recipient of a tax invoice must give written consent that they are prepared to accept electronic documents. A checkbox has been included on the processing tab on the customer’s account that you need to select once your customer has given written consent.
- Electronic Document Format
All PDF documents emailed from Pastel are 128 bit encrypted.
- Marking documents as “Computer Generated”
The emailed document will constitute the original tax invoice, credit or debit note. Copies extracted from the system will display the words “computer generated copy tax invoice”, “computer generated copy credit note” or “computer generated copy debit note”.
- Audit Trail report of all Electronic Documents
An audit trail report can be generated that will display all emailed tax invoices, debit notes and credit notes. To run the report, select View...General Ledger...Tax...Audit Trail of Electronic Tax Documents from the main menu.