Negative amounts on prepayments

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Posted on by rostad.exe

Dead Community,

We are a manufacturing company that sells vehicles.
Currently the Italian authorities gives out a "ECOBONUS" for some vehicles with a low carbon footprint.

In order to claim this ECOBONUS from Italian authorities we need to state on the customer invoice that we've deducted the ecobonus amount.

The issue follows:
We use the prepayment functionality for all sales in Italy and we can't add a negative sales line for the ecobonus amount that's deducted for the whole sales order.

Is it safe to customize away the "Prepayment lines cannot be negative" error message or are there any risks with doing it?
Is there another way we can handle it?

The ecobonus is not a discount but rather an amount that should be deducted from the total invoice amount.

Many thanks! / Daniel

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Nitin Verma 21,309 Moderator on at

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RE: Negative amounts on prepayments

Adding more info. Yes you can raise some event if system or user tries to enter any amount in negative.

Thanks.
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Jun Wang 7,604 Super User 2025 Season 1 on at

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RE: Negative amounts on prepayments

you could consider create an item charge, then put in a negative amount. Assign it to the item line and total invoice will be deducted. below is an example using sales allowance. But you can create a new one like ecobonus etc.