Error When Using Decimal Values in 'Quantity per' for Assembly Orders

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Posted on by Hecht

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When we try to post an assembly order with a decimal value in the 'Quantity per' field (for example, 0.6), we receive an error message:
'Reserved Qty. (Base) must be reduced'.

If we change the 'Quantity per' to 1, we are able to post the assembly order without issues.

Has a new, hidden functionality been introduced in version 26 that someone out there knows about?

Thanks.

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Dynamics 365 Business Central

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Jinal P. 270 on at

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Error When Using Decimal Values in 'Quantity per' for Assembly Orders

Hello,

Can you please share the screenshot of your unit of measure code table from Assembly order page?

Also please check if there's any reservation that doesn't match your decimal quantity, If there’s a reservation that's rounding to a whole number, you'll need to manually adjust or delete it.

Thanks

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Hecht 125 on at

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Error When Using Decimal Values in 'Quantity per' for Assembly Orders

Hello,

We have used BC for 4 years and have had zero problems regarding Unit of Measure. The Quantity Rounding Precision is generally blank on every item number.

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Sagar Dangar, MCP 793 Super User 2025 Season 2 on at

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Error When Using Decimal Values in 'Quantity per' for Assembly Orders

Hi,

Please Cancel item reservation and then change "Quantity per". it should work

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YUN ZHU 93,654 Super User 2025 Season 2 on at

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Error When Using Decimal Values in 'Quantity per' for Assembly Orders

I did a simple test and there is no error in posting in BC26.1. From the error message, it is a problem with Reservation. You can check the settings in this area.

More details: https://learn.microsoft.com/en-us/dynamics365/business-central/inventory-how-to-reserve-items?wt.mc_id=DX-MVP-5004336

Hope this helps.

Thanks.

ZHU

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Hecht 125 on at

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Error When Using Decimal Values in 'Quantity per' for Assembly Orders

We’ve now gone through the suggested solutions, but we’re still experiencing issues.

It appears everything works as expected when we enter a value of 1 or higher in the "Quantity per" field. However, values below 1 – for example, 0.6 – result in an error.

We’ve tested with decimals above 1 (e.g., 1.5 or 4.99999), and everything processes without any issues.

Do you know if there’s a setting that could be restricting values below 1 in this field?

Thanks

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Sohail Ahmed 11,099 Super User 2025 Season 2 on at

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Error When Using Decimal Values in 'Quantity per' for Assembly Orders

This might be helpful for resolving your issue:

The error occurs because Business Central performs quantity validation differently when using decimal values in assembly orders. Here's what you need to know:

Base Unit of Measure Check:

BC validates that the total reserved quantity (in base units) must be a whole number

When using 0.6 in 'Quantity per', the system calculates fractional base units

Solution Options:

Round your 'Quantity per' to whole numbers where possible

Adjust your item's base unit of measure to accommodate decimal quantities

Check if you have any new reservation policies enabled in v26

Version 26 Consideration:

While no hidden functionality was officially introduced, v26 did enhance inventory precision controls

Verify your reservation entries (Item Tracking Lines) for any fractional quantities

Reference: Assembly Order Quantity Validation

If this resolves your issue, please mark this answer as verified. For more complex scenarios, consider consulting with a Microsoft Partner.

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Claus Macali.dk 1,043 on at

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Error When Using Decimal Values in 'Quantity per' for Assembly Orders

The soultion could be you add 0.01 to the rounding presion, on the item card

hope this works,

Strange the behavior, get on a Ess BC ver, as this field is not on the item card page, on for the premium, its thier.

Then you need to use Cinfig Pack to update

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Khushbu Rajvi. 19,886 Super User 2025 Season 2 on at

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Error When Using Decimal Values in 'Quantity per' for Assembly Orders

Adding more details: https://learn.microsoft.com/en-us/troubleshoot/dynamics-365/supply-chain/warehousing/decimal-rounding-of-physical-updating-quantity-unit-incorrect-error

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Hecht 125 on at

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Error When Using Decimal Values in 'Quantity per' for Assembly Orders

Many thanks for all the great suggestions you have provided. For the sake of clarity, I would like to report back with what finally solved our problem.

All our own customizations had been uninstalled, and we had also uninstalled purchased extensions in order to troubleshoot the issue — all without success.

The simple solution came when it became possible to upgrade from 26.0 to 26.1. After the upgrade, all problems disappeared like snow in the sun. We therefore conclude that there was a bug in the software.

We struggled with this issue for about 4 weeks before it was resolved. It would have been helpful to have a more direct approach to Microsoft in order to clarify where the problem was and what the expected timeline for a resolution might be. This was sorely missed in this process.

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CH-14080031-0 6 on at

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Error When Using Decimal Values in 'Quantity per' for Assembly Orders

Could you please share your Platform and Application version?
We are having the same issue.

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