ERPNext - Adjust invoice due amount with another sales return or credit note

Here we explain ERPNext sales invoice adjustments. This can be applied to Purchases also. Here a customer returns an invoice fully or partially and makes another purchase and asks the company to adjust the second invoice with the first.
Example
Make invoice for $1000 (Say INV0001)
Make payment entry for $1000
Make credit note against the first invoice, to log retun
Then make another Sales Invoice of $1000 (say INV0002)
Then use Journal Entry to knock-off new invoice (#2) against the old invoice (#1).
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[@9z6_18]

Very cool

[@JunaidHussain73]

Good to learn this

[@RupeshPRajan]

cool. Thanks for sharing

[@assistantLS]

I have made a sales invoice and have submitted it, however my manager told me to modify the CI as we need to take out the 10% Vat. First, am I right that I can no longer modify the vat section after submitted status? What should I do please?

[@afsal2012]

Hello sir, can you clear me another doubt not related to this?
I had two invoices in my erp which i have cancelled and deleted because of mistake in creating the item to include the item tax template. Then i was trying to create the new invoices instead of the deleted two's but the invoice number is changed 😕 now i dont know what to do? Also when i scanned the previous cancelled plus deleted invoices using e invoice qr code scanner it was shoeing as existing? What shall i do to rectify this problem?