Microsoft Access Northwind Credit Notes

I am trying to work out how the Microsoft Access Northwind database handles credit notes at a table level?
Are they entered as negative invoices? Which tables are affected?
Murray BrownMicrosoft Cloud Azure/Excel Solution DeveloperAsked:
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Gustav BrockCIOCommented:
It's the sum of the invoice lines.

If either quantity or unit price is negative, so is the invoice line, and if the invoice lines sums up to be a negative total, the invoice becomes a credit note.
Murray BrownMicrosoft Cloud Azure/Excel Solution DeveloperAuthor Commented:
Thanks for the help
Gustav BrockCIOCommented:
You are welcome!
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