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Once you have worked out what does need to be invoiced because there was never an invoice on the supplier's account, then invoice it by getting a copy of the purchase invoice from the supplier.
Manually invoicing one or more finalised purchase receipt
Invoicing duplicated posted purchase receipt to a MISC supplier.
Once only, before you start invoicing any duplicated receipts that can’t be reversed to the MISC supplier. You have to create a MISC supplier and put them set the status on this supplier to be on stop.For Uninvoiced purcahse receipts, already receipted on another receipt and invoiced
Invoice all the uninvoiced purchase receipts to this supplier, by navigating the uninvoiced purchase receipts and clicking on the Invoice action button on each one.
On the invoice, firstly ensure to change the supplier to MISC from the existing suppliersupplier
Ensure you select the Cost method of 'Do not update costs'
Click on Default the total
Leave the value of the purchase invoice to be the same value as the purchase receipt.
Finalise the purchase invoice
An open item will apply onto the MISC supplier card.
Repeat all of the above steps for all of the purchase receipts that have not been invoiced to the supplier of MISC if they have an existing purchase receipt and invoice.
Then navigate to the card to write off the invoices as they are already invoiced originally on a duplicate .
Navigate to the Cards Module
Find the card and highlight the supplier of MISC
Work out the total value that you have invoiced to this Misc Supplier for those duplicated purchase receipts
Use the new action button, drop down the list below and select new and select "supplier Credit".
Create a supplier credit and post it against the gl account of stock qty adjustment or an appropriate stock adjustment gl account. You can speak to your accountant as to which general ledger account you wish to use.
You may need to make available on the General ledger account the transaction type of Supcre.