[docs] backup manager docs

docs/user/accounts/docs.user.accounts.purchase_invoice.md

@@ -11,6 +11,16 @@ To make a new Purchase Invoice, go to:
 
 or click on “Make Purchase Invoice” in Purchase Order or Purchase Receipt.
 
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+![Purchase Invoice](img/purchase-invoice.png)
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 The concept of “Posting Date” is again same as Sales Invoice. “Bill No” and “Bill Date” helps to track the bill number as set by your Supplier for reference.
 
 #### Accounting Impact