If you wish to use the register open Menu > View > Parameters ? Purchase > General Page check ‘Use Invoice Register‘
To record a supplier invoice, click menu Daybooks > Purchase Daybook > Post Invoices.
Alternatively, click the Post Purchase Invoices button on the toolbar.
The Purchase Daybook Post Invoice Form is displayed.
Select the supplier whose invoice you want to post and enter the invoice details.
Once you’ve entered all the invoice details, click OK to record it.
The details of the postings are now available on Ledgers > Purchase > Invoice register. Once an invoice has been authorised you need to update the ledger from this sub menu.