Small and medium business | Business Central, N...

Sales order posting issue

(3) Share

Report

Posted on by CU11031501-1

I am facing an error while posting a Sales Order.
The order is 100% prepaid, and the prepayment invoice has already been created, which also includes the tax amount.
However, when I try to post the final invoice, this error appears. Based on my analysis, it seems that Business Central is calculating the tax twice, which is causing the error.
I have not been able to find a way to resolve this issue. Could you please help me identify the cause and guide me on how to fix it?

Original Invoice amount:

I have the same question (0)

All responses (2)

Answers (0)

Sort by

Suggested answer

OussamaSabbouh 15,186 Super User 2026 Season 1 on at

Like (1)

Report
Copy link

Link copied!

Hello,

This error is typically caused by a rounding difference when posting a 100% prepayment order with tax. Since the prepayment invoice already includes the tax, Business Central recalculates totals again when posting the final invoice, and if the calculated amount differs slightly (due to rounding precision in currency, tax, or invoice rounding setup), BC tries to create a rounding line in the general journal but cannot, which triggers the message “Amount … needs to be rounded in Gen. Journal Line”. In practice, it’s not that tax is calculated twice; it’s that the prepayment + tax and the final invoice calculation produce a small rounding difference. The fix is usually to verify Amount Rounding Precision, Unit-Amount Rounding Precision, Currency rounding (USD), and Invoice Rounding setup with a rounding account so Business Central can automatically post the small difference.

Regards,
Oussama Sabbouh

Was this reply helpful? Yes No
Suggested answer

YUN ZHU 100,212 Super User 2026 Season 1 on at

Like (0)

Report
Copy link

Link copied!

Hi, hope the following helps.

Solved: Amount [Amount] needs to be rounded in Gen. Journal Line Journal Template Name='',Journal Batch Name='',Line No.='0'.

Thanks.

ZHU

Was this reply helpful? Yes No

Join the conversation

Community site session details

Sales order posting issue

Helpful resources

Quick Links

Introducing the 2026 Season 1 community Super Users

Meet the Microsoft Dynamics 365 Contact Center Champions

Congratulations to the April Top 10 Community Leaders

Leaderboard > Small and medium business | Business Central, NAV, RMS

Featured topics

Product updates

Community site session details

Sales order posting issue

Helpful resources

Quick Links

Introducing the 2026 Season 1 community Super Users

Meet the Microsoft Dynamics 365 Contact Center Champions

Congratulations to the April Top 10 Community Leaders

Subscribe to this forum!

Select categories

Leaderboard > Small and medium business | Business Central, NAV, RMS

Featured topics

Product updates