Example in Wantzel Studio
Checking invoices against order and receipt
Every invoice is laid next to its order and goods receipt. A changed bank account is caught and goes to a person.

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Checking invoices against order and receipt
- Lays each invoice next to its purchase order and goods receipt.
- Finds a price that moved, more invoiced than received, a duplicate and an invoice without an order.
- Holds an invoice whose bank account differs from the supplier register until a person has called the supplier back.
- Pays and books nothing: a person decides.

Thirty-six invented invoices: 20 match, 16 need a person, the changed bank account on top. 
The bank account on the invoice is not the one in the register, so a person calls the supplier back first.
This example is in Wantzel Studio: open it under Examples, build it and run it. Try it live with invented data.