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Amount Must be Negative in Gen. Journal Line

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Posted on by Ahmad Subhani

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Hi,

Thanks In Advance.

Amount must be negative in Gen. Journal Line Journal Template Name='',Journal Batch Name='',Line No.='0'.

I have Posted Prepayment Sales Invoice (100%) and then posted the complete final Invoice with 0 Value.

Now i am trying to post the credit memo, linking with Final settle invoice. Only for selected Lines.

It is coming in Sales Credit Memo, not on journals.

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Dynamics 365 Business Central

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CU02041430-0 4 on at

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Sales create general journal lines during posting. Do you have negative lines in your credit memo? That might be the issue.

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Teagen Boll 1,436 Super User 2026 Season 1 on at

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If you have a final invoice at 0$, I don't believe you will be able to post a credit memo. Credit memos are applied at the invoice header level and not the line level.

Depending on what you're trying to achieve, what you could do is create a manual credit memo and post it without applying it to that invoice. You could then manually apply that document as needed to other entries for that customer.

Best,

Teagen

Catapult ERP

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Valentin Castravet 32,208 Super User 2026 Season 1 on at

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If you want to post a $0 credit memo, clear the Applies-to Doc. No. field on the credit memo so that it's blank. The system considers a $0 document closed, so the $0 credit memo cannot be applied to the $0 invoice, that's why you get the error message when you try to post it.

But can you confirm why you want to credit a $0 invoice?

Valentin Castravet
Work: Zander ERP Services
Blog: Dynamics 365 Business Central Insights
LinkedIn: www.linkedin.com/in/valentin-c-0500a247/

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OussamaSabbouh 12,965 Super User 2026 Season 1 on at

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Hello,

This happens because the final invoice is 0.00, so it’s the wrong document to credit/apply against; the real value sits in the posted prepayment invoice, and when you try to credit selected lines against the zero-value final invoice, BC ends up creating an internal posting with the wrong sign and throws “Amount must be negative…”. The fix is usually to reverse/correct the prepayment document using Prepayment > Post Prepayment Credit Memo (or create a corrective credit memo from the posted invoice that actually has the amount), instead of linking the credit memo to the final settlement invoice.

Regards,
Oussama Sabbouh

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