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Assembly orders without pre defined BOM

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Posted on by UD-29071948-0

Hi everyone,

i have a case where i want to create assembly order but without pre defined BOM for the finished product

because i want to enter the lines manually through integration , but the problem is the cost of the output order is coming with zero.

how can i achieve this and have the cost for the finished item from the Assembly order so i can sell?

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Dynamics 365 Business Central

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OussamaSabbouh 5,646 on at

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Hello,

To ensure that the cost is calculated correctly, you need to make sure that the components you are using in the assembly order have their costs defined. The system calculates the cost of the finished item based on the costs of the components used in the assembly.

- If you are integrating this process, ensure that the integration includes the necessary cost information for each component.

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YUN ZHU 95,329 Super User 2025 Season 2 on at

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Not sure which cost method you used, but try running the following Batch first.

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

Thanks.

ZHU

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Sohail Ahmed 11,136 Super User 2025 Season 2 on at

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In Business Central, Assembly Orders require a BOM to calculate cost and output properly. If you create an Assembly Order without a predefined BOM, and manually add lines (via integration or UI), the system won’t calculate the output cost automatically — that’s why you're seeing zero cost.

✅ To fix this:

You can still use manual lines, but you must fill in the “Unit Cost” on each component line in the Assembly Order. BC will then calculate the cost of the finished item based on those lines.

If you're doing this via integration, make sure the component lines include unit cost and quantity before posting.

✅ Mark this answer as verified if it helps you.

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Mansi Soni 8,907 Super User 2025 Season 2 on at

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Hello,

In Business Central, if you're creating an Assembly Order without a predefined BOM and manually adding lines through integration, the output cost may show as zero because the system calculates the cost based on the components consumed. To ensure the finished item reflects the correct cost:

1. Make sure all component lines (with valid item, quantity, and cost) are added before posting the assembly output.
2. Confirm that component items have accurate unit costs.
3. After posting, run the Adjust Cost - Item Entries batch job to update the cost of the finished item based on its consumed components.
Hope this answer will help you!

Regards,
Mansi Soni

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Gerardo Rentería Ga... 25,154 Most Valuable Professional on at

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Hi

Can you check if your integration includes component costs? It's necessary to work with complete assembly lines with these values.

Assembly Management - Business Central | Microsoft Learn

Best

GR

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