The final bill amount in invoicing is the amount that appears on the bill form or payment form after rendering of accounts. In invoicing, the payment method or repayment method is determined for this amount.
The final bill amount is saved in the header data of the print document (table Print document / header data ERDK) in the TOTAL_AMNT field.
With the standard settings, the final bill amount is made up of the results of consumption valuation, minus paid budget billings, plus any other account items settled in invoicing (in account maintenance) or additional functions (such as dunning and interest calculation) created in invoicing.
You can also include additional open items as subitems in the final bill amount. 
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